Cell Biology and Biodiversity

Introduction to Biology - Meaning and application of Biology

By the end of the lesson, the learner should be able to:

- Define the term Biology and explain its origin from Greek words
- Search for information on the meaning of Biology using print and non-print media
- Recognise how Biology helps in understanding diseases, food production and environmental conservation in daily life

In groups, learners are guided to:

- Use print and non-print media to search for the meaning of Biology
- Brainstorm and use the Greek words 'bios' and 'logos' to derive the meaning of Biology
- Discuss the application of Biology in healthcare, agriculture, nutrition, environmental conservation, hygiene, biotechnology and forensic science

Why is it important to study Biology?

- Distinction Biology Learner's Book Grade 10 pg. 1
- Digital resources
- Internet access

- Oral questions - Observation - Written assignments

Cell Biology and Biodiversity

Introduction to Biology - Application of Biology in everyday life
Introduction to Biology - Fields of study in Biology

By the end of the lesson, the learner should be able to:

- Describe the application of Biology in healthcare, agriculture, food production, environmental conservation and biotechnology
- Explain how Biology is applied in everyday life using pictures and illustrations
- Connect the role of Biology to real life situations such as disease prevention, food safety and waste management

In groups, learners are guided to:

- Use flashcards and pictures to identify ways Biology is applied in everyday life
- Discuss how Biology is applied in healthcare, agriculture, nutrition, hygiene, forensic science and industry
- Write short notes on the application of Biology in everyday life

How is Biology applied in everyday life?

- Distinction Biology Learner's Book Grade 10 pg. 3
- Charts and pictures
- Digital resources
- Distinction Biology Learner's Book Grade 10 pg. 5
- Internet access

- Oral questions - Observation - Written assignments

Cell Biology and Biodiversity

Introduction to Biology - Careers related to fields of study in Biology
Introduction to Biology - Factors influencing career choices

By the end of the lesson, the learner should be able to:

- Relate fields of study in Biology to career opportunities
- Design a career wheel to illustrate the relationship between fields of study and careers
- Connect career opportunities in Biology to real life professionals such as doctors, veterinary officers, environmental scientists and forensic scientists in the community

In groups, learners are guided to:

- Use locally available materials to design a career wheel relating fields of study to careers
- Play fishing games or career match-up challenge to present information on fields and careers related to Biology
- Discuss and relate various career opportunities to fields of study in Biology

How do fields of study in Biology relate to career opportunities?

- Distinction Biology Learner's Book Grade 10 pg. 7
- Manila paper, scissors, glue, marker pens
- Flashcards
- Distinction Biology Learner's Book Grade 10 pg. 11
- Digital resources
- Internet access

- Oral questions - Observation - Project assessment

Cell Biology and Biodiversity

Introduction to Biology - Importance of Biology in everyday life
Specimen Collection and Preservation - Apparatus for collecting specimen

By the end of the lesson, the learner should be able to:

- Outline the importance of Biology in everyday life
- Explain how Biology equips individuals with scientific skills such as observation, classification, prediction and communication
- Identify how Biology helps solve real life problems such as pollution control, disease management and improving food production in the community

In groups, learners are guided to:

- Discuss everyday life activities that require knowledge and skills in Biology
- Write short notes on the importance of Biology in everyday life
- Present findings on the importance of Biology for peer assessment

How does the knowledge of Biology improve everyday life?

- Distinction Biology Learner's Book Grade 10 pg. 13
- Digital resources
- Internet access
- Distinction Biology Learner's Book Grade 10 pg. 16
- Pictures and charts of specimen collecting apparatus

- Oral questions - Observation - Written assignments

Cell Biology and Biodiversity

Specimen Collection and Preservation - Apparatus for processing and preserving specimen
Specimen Collection and Preservation - Sorting, pressing and drying of specimen

By the end of the lesson, the learner should be able to:

- Identify apparatus and materials used for processing and preserving specimen such as scalpel, hand lens, tracing paper, labels and preservatives
- Describe the uses of apparatus for processing and preserving specimen
- Connect specimen processing to real life applications such as how laboratory technicians prepare blood samples for testing in hospitals

In groups, learners are guided to:

- Study charts showing apparatus and materials used for processing specimen and identify their uses
- Discuss the meaning and importance of preservation of biological specimen
- Discuss different methods of preservation including dry, wet and refrigeration methods

What apparatus are used for processing and preserving specimen?

- Distinction Biology Learner's Book Grade 10 pg. 20
- Charts and pictures
- Specimen containers
- Distinction Biology Learner's Book Grade 10 pg. 22
- Plant press
- Absorbent paper

- Oral questions - Observation - Written assignments

Cell Biology and Biodiversity

Specimen Collection and Preservation - Mounting, labelling, storage and protection of specimen
Specimen Collection and Preservation - Making a herbarium
Specimen Collection and Preservation - Improvising apparatus for collecting specimen

By the end of the lesson, the learner should be able to:

- Describe the steps of mounting, labelling, storage and protection of specimen
- Explain the importance of correct labelling and proper storage of preserved specimen
- Relate proper specimen labelling and storage to real life practices such as how hospitals label patient samples to avoid mix-ups

In groups, learners are guided to:

- Discuss mounting of specimen on paper, slides or cardboard
- Discuss the details recorded when labelling specimen including name, date, location and preservative used
- Discuss methods of storing preserved specimen in herbaria, slide boxes and airtight glass jars

How are preserved specimen stored and protected?

- Distinction Biology Learner's Book Grade 10 pg. 26
- Mounting paper, glue, labels
- Permanent marker pens
- Distinction Biology Learner's Book Grade 10 pg. 29
- Plant press, mounting paper, glue
- Labels, pair of secateurs, hand gloves
- Distinction Biology Learner's Book Grade 10 pg. 33
- Plastic containers, straws, rubber bands
- Mesh cloth, small stones

- Oral questions - Observation - Written assignments

Cell Biology and Biodiversity

Specimen Collection and Preservation - Improvising a sweep net and other apparatus
Specimen Collection and Preservation - Collecting, processing and preserving an animal specimen

By the end of the lesson, the learner should be able to:

- Improvise a sweep net using locally available materials such as wire, mesh cloth, tape and a strong stick
- Use improvised apparatus to collect specimen for biological studies
- Connect improvisation to real life practices such as farmers using locally available traps to manage pests in their farms

In groups, learners are guided to:

- Improvise a sweep net using thin metal wire, mesh cloth, tape and a strong stick
- Use the improvised sweep net and pooter to collect insect specimen
- Discuss improvising other apparatus such as specimen containers and preservatives

How can a sweep net be improvised for collecting specimen?

- Distinction Biology Learner's Book Grade 10 pg. 35
- Thin metal wire, mesh cloth, tape
- Strong stick, pair of scissors
- Distinction Biology Learner's Book Grade 10 pg. 37
- Ethanol, airtight glass jars, pins
- Forceps, hand gloves, labels

- Oral questions - Observation - Practical assessment

Cell Biology and Biodiversity

Specimen Collection and Preservation - Project on collecting, processing and preserving biological specimen

By the end of the lesson, the learner should be able to:

- Plan and carry out a project on collecting, processing and preserving biological specimen
- Draft a budget for the project considering financial literacy
- Relate budgeting and project planning to real life situations such as planning school activities or community projects to manage resources efficiently

In groups, learners are guided to:

- Plan and draft a budget for the project on collecting, processing and preserving biological specimen
- Carry out the project as a group and document the progress
- Present project findings in class for discussion and keep records in a portfolio

How do you plan a project on specimen collection and preservation?

- Distinction Biology Learner's Book Grade 10 pg. 38
- Specimen collecting apparatus
- Preservatives, labels, mounting materials

- Project assessment - Oral questions - Portfolio assessment

Cell Biology and Biodiversity

Specimen Collection and Preservation - Importance of collecting, processing and preserving biological specimen
Cell Structure and Specialisation - Differences between light and electron microscope

By the end of the lesson, the learner should be able to:

- Explain the importance of collecting, processing and preserving biological specimen
- Outline how specimen preservation allows for future research, conservation and monitoring of pests and diseases
- Relate specimen preservation to real life examples such as how national museums conserve species records and how agricultural officers monitor crop pests

In groups, learners are guided to:

- Discuss the importance of collecting, processing and preserving specimen for study, future reference, conservation and pest monitoring
- Write short notes on the importance of specimen preservation
- Present findings in class for discussion

Why is it important to collect, process and preserve biological specimen?

- Distinction Biology Learner's Book Grade 10 pg. 38
- Digital resources
- Internet access
- Distinction Biology Learner's Book Grade 10 pg. 39
- Light microscope
- Charts of electron microscope
- Digital resources

- Oral questions - Observation - Written assignments

Cell Biology and Biodiversity

Cell Structure and Specialisation - Preparation of temporary slides
Cell Structure and Specialisation - Estimation of cell size during microscopy

By the end of the lesson, the learner should be able to:

- Describe the processes of sectioning, fixation, staining and mounting during slide preparation
- Prepare a temporary slide of an onion epidermal cell for observation under a light microscope
- Relate slide preparation skills to real life laboratory work such as how medical lab technologists prepare tissue samples for disease diagnosis

In groups, learners are guided to:

- Discuss the meaning and importance of sectioning, fixation, staining and mounting
- Carry out a practical activity to prepare a temporary slide of an onion epidermal cell
- Observe the prepared slide under a light microscope

How are temporary slides prepared for observation?

- Distinction Biology Learner's Book Grade 10 pg. 41
- Light microscope, slides, cover slips
- Onion bulb, iodine solution, scalpel, forceps, ethanol
- Distinction Biology Learner's Book Grade 10 pg. 44
- Light microscope
- Transparent ruler
- Prepared slide of onion epidermal cell

- Oral questions - Observation - Practical assessment

Cell Biology and Biodiversity

Cell Structure and Specialisation - Plant and animal cell structure under the electron microscope
Cell Structure and Specialisation - Structures and functions of cell organelles
Cell Structure and Specialisation - Modelling plant and animal cells as seen under the electron microscope

By the end of the lesson, the learner should be able to:

- Describe the structure of plant and animal cells as observed under an electron microscope
- Draw and label the structure of plant and animal cells as seen under an electron microscope
- Connect the study of cell structure to real life examples such as how understanding cell membranes helps in developing medicines that target specific cells

In groups, learners are guided to:

- Use photomicrographs and charts to compare the structure of plant and animal cells as seen under electron microscope
- Draw and label the structure of plant and animal cells and share with peers
- Discuss the structural differences between plant and animal cells

Why do plant and animal cells differ?

- Distinction Biology Learner's Book Grade 10 pg. 47
- Photomicrographs and charts of plant and animal cells
- Digital resources
- Distinction Biology Learner's Book Grade 10 pg. 50
- Charts and photomicrographs
- Distinction Biology Learner's Book Grade 10 pg. 55
- Carton box, modelling clay, beans, beads
- Balloons, glue, scissors, water colours

- Oral questions - Observation - Written assignments

Cell Biology and Biodiversity

Cell Structure and Specialisation - Specialised cells in plants
Cell Structure and Specialisation - Specialised cells in animals

By the end of the lesson, the learner should be able to:

- Describe the structure and function of specialised cells in plants including root hair cells, palisade cells, guard cells and pollen grains
- Relate the structures of specialised plant cells to their functions
- Connect plant cell specialisation to real life examples such as how root hairs help plants absorb water during drought and how guard cells control water loss in hot weather

In groups, learners are guided to:

- Use photomicrographs and permanent slides to observe specialised plant cells
- Discuss the adaptations of root hair cells, palisade cells, guard cells and pollen grains to their functions
- Draw and label specialised plant cells

How are cells specialised in plants?

- Distinction Biology Learner's Book Grade 10 pg. 59
- Photomicrographs of specialised plant cells
- Charts and diagrams
- Digital resources
- Distinction Biology Learner's Book Grade 10 pg. 61
- Photomicrographs of specialised animal cells

- Oral questions - Observation - Written assignments

Cell Biology and Biodiversity

Cell Structure and Specialisation - Cell organisation: Organelles, cells and tissues

By the end of the lesson, the learner should be able to:

- Describe the levels of cell organisation from organelles to cells to tissues
- Identify examples of tissues in plants and animals
- Connect cell organisation to real life examples such as how muscle tissues work together to enable body movement during sports and daily activities

In groups, learners are guided to:

- Use digital devices to search for information on levels of cell organisation
- Discuss the hierarchy of cell organisation: organelles, cells, tissues, organs, organ systems and organism
- Identify and discuss examples of tissues in plants and animals including palisade tissue, blood tissue, skeletal muscle tissue and epithelial tissue

How are cells organised in living organisms?

- Distinction Biology Learner's Book Grade 10 pg. 64
- Charts and diagrams
- Digital resources

- Oral questions - Observation - Written assignments

Cell Biology and Biodiversity

Cell Structure and Specialisation - Cell organisation: Organs and organ systems

By the end of the lesson, the learner should be able to:

- Describe organs and organ systems in plants and animals
- Explain the interrelationship between organs within an organ system
- Connect organ systems to real life examples such as how the digestive system processes food eaten daily and how the circulatory system transports nutrients and oxygen throughout the body

In groups, learners are guided to:

- Discuss examples of organs in plants and animals including roots, leaves, heart, lungs and kidneys
- Discuss organ systems in plants and animals including root system, shoot system, vascular system, digestive system, circulatory system and respiratory system
- Fill in tables identifying organ systems and their component organs

How do organs and organ systems function in living organisms?

- Distinction Biology Learner's Book Grade 10 pg. 66
- Charts and diagrams
- Digital resources

- Oral questions - Observation - Written assignments

Cell Biology and Biodiversity

Cell Structure and Specialisation - Differences between plant and animal cells

By the end of the lesson, the learner should be able to:

- Compare and contrast plant and animal cells as seen under the electron microscope
- Summarise the key differences in a table format
- Connect the differences between plant and animal cells to real life observations such as why plants have rigid shapes due to cell walls while animal bodies are flexible

In groups, learners are guided to:

- Discuss differences between plant and animal cells including cell wall, chloroplast, vacuole, centriole and shape
- Complete comparison tables identifying structures present in plant and animal cells
- Attempt revision questions on cell structure and specialisation

What are the key differences between plant and animal cells?

- Distinction Biology Learner's Book Grade 10 pg. 47
- Charts and photomicrographs
- Digital resources

- Oral questions - Written tests - Observation

Cell Biology and Biodiversity

Cell Structure and Specialisation - The cell as the basic unit of life
Chemicals of Life - Composition, properties and functions of carbohydrates (Monosaccharides)
Chemicals of Life - Composition, properties and functions of carbohydrates (Disaccharides and polysaccharides)

By the end of the lesson, the learner should be able to:

- Explain the importance of the cell as the basic unit of life
- Summarise the structure, functions and organisation of cells in living organisms
- Connect the concept of cells as building blocks of life to real life examples such as how wound healing involves cell division and how growth results from increase in number of cells

In groups, learners are guided to:

- Discuss the importance of cells as basic units of life in living organisms
- Summarise content on cell structure, specialisation and organisation
- Attempt assessment questions on cell structure and specialisation

Why is the cell considered the basic unit of life?

- Distinction Biology Learner's Book Grade 10 pg. 39
- Charts and diagrams
- Digital resources
- Distinction Biology Learner's Book Grade 10 pg. 68
- Glucose, ripe fruits, distilled water
- Beakers, stirring rod
- Distinction Biology Learner's Book Grade 10 pg. 72
- Sugarcane juice

- Written tests - Oral questions - Observation

Cell Biology and Biodiversity

Chemicals of Life - Investigating the presence of carbohydrates in food substances
Chemicals of Life - Composition, properties and functions of proteins

By the end of the lesson, the learner should be able to:

- Investigate the presence of starch using iodine solution test
- Investigate the presence of reducing and non-reducing sugars using Benedict's solution
- Relate food testing to real life situations such as how food scientists test food products for quality control and nutritional labelling

In groups, learners are guided to:

- Carry out a practical activity to test for the presence of starch using iodine solution
- Carry out a practical activity to test for reducing sugars using Benedict's solution
- Carry out a practical activity to test for non-reducing sugars using hydrochloric acid and Benedict's solution

How is the presence of carbohydrates in food determined?

- Distinction Biology Learner's Book Grade 10 pg. 76
- Iodine solution, Benedict's solution, dilute HCl, NaOH
- Test tubes, hot water bath, food samples
- Distinction Biology Learner's Book Grade 10 pg. 81
- Egg white, sodium hydroxide, copper (II) sulphate
- Test tubes, measuring cylinder

- Oral questions - Observation - Practical assessment

Cell Biology and Biodiversity

Chemicals of Life - Composition, properties and functions of lipids
Chemicals of Life - Composition, properties and functions of vitamins

By the end of the lesson, the learner should be able to:

- Describe the composition, properties and functions of lipids
- Investigate the presence of lipids in food substances using the emulsion test and grease spot test
- Relate knowledge of lipids to real life examples such as why cooking oil is used for frying food, why whales have thick fat layers for insulation and why oily foods leave grease marks on paper

In groups, learners are guided to:

- Discuss the composition of lipids including fatty acids and glycerol joined by ester bonds
- Discuss properties and functions of lipids in living organisms
- Carry out emulsion test and grease spot test to investigate the presence of lipids in food substances

How is the presence of lipids in food determined?

- Distinction Biology Learner's Book Grade 10 pg. 85
- Cooking oil, ethanol, distilled water, filter paper
- Test tubes, measuring cylinder
- Distinction Biology Learner's Book Grade 10 pg. 91
- DCPIP solution, lemon juice, test tubes
- Measuring cylinder, dropper

- Oral questions - Observation - Practical assessment

Cell Biology and Biodiversity

Chemicals of Life - Enzymes: Meaning and properties of enzymes
Chemicals of Life - Investigating the presence of catalase enzymes in living tissues

By the end of the lesson, the learner should be able to:

- Define enzymes and explain their role as biological catalysts
- Describe the properties of enzymes including specificity, reusability and protein nature
- Relate enzyme function to real life examples such as how saliva breaks down starch in the mouth during digestion and how enzyme-based detergents remove stains from clothes

In groups, learners are guided to:

- Use print and non-print media to search for the meaning of enzymes
- Discuss the naming of enzymes based on their substrates
- Discuss the properties of enzymes including their protein nature, specificity, reusability and sensitivity to temperature and pH

What are enzymes and how do they function?

- Distinction Biology Learner's Book Grade 10 pg. 94
- Digital resources
- Internet access
- Distinction Biology Learner's Book Grade 10 pg. 96
- Fresh and boiled potato or liver, hydrogen peroxide
- Test tubes, wooden splint, scalpel

- Oral questions - Observation - Written assignments

Cell Biology and Biodiversity

Chemicals of Life - Factors affecting enzyme activity: Temperature and pH

By the end of the lesson, the learner should be able to:

- Determine the effect of temperature on enzyme activity through experiments
- Determine the effect of pH on enzyme activity through experiments
- Relate factors affecting enzymes to real life examples such as why food is stored in refrigerators to slow spoilage and why the stomach produces acid for digestion by pepsin

In groups, learners are guided to:

- Carry out a practical activity to investigate the effect of temperature on enzyme activity using amylase and starch solution at different temperatures
- Carry out a practical activity to investigate the effect of pH on enzyme activity using pepsin and egg albumen
- Draw graphs showing the effect of temperature and pH on enzyme activity

How do temperature and pH affect enzyme activity?

- Distinction Biology Learner's Book Grade 10 pg. 98
- Amylase, starch solution, iodine solution, pepsin
- Water baths, HCl, NaOH, test tubes, thermometer

- Oral questions - Observation - Practical assessment

Cell Biology and Biodiversity

Chemicals of Life - Factors affecting enzyme activity: Substrate and enzyme concentration
Chemicals of Life - Functions of water and mineral salts

By the end of the lesson, the learner should be able to:

- Determine the effect of substrate concentration on enzyme activity through experiments
- Determine the effect of enzyme concentration on enzyme activity through experiments
- Relate substrate and enzyme concentration to real life examples such as why adding more yeast speeds up dough rising in baking and how enzyme inhibitors in pesticides control pests

In groups, learners are guided to:

- Carry out a practical activity to investigate the effect of substrate concentration on enzyme activity using hydrogen peroxide at different concentrations
- Carry out a practical activity to investigate the effect of enzyme concentration using pepsin at different concentrations
- Discuss enzyme inhibitors, cofactors and co-enzymes

How do substrate and enzyme concentration affect enzyme activity?

- Distinction Biology Learner's Book Grade 10 pg. 102
- Hydrogen peroxide at different concentrations, potato or liver
- Pepsin, egg white, HCl, test tubes, water bath
- Distinction Biology Learner's Book Grade 10 pg. 104
- Charts showing sources of mineral salts
- Digital resources

- Oral questions - Observation - Practical assessment

Cell Biology and Biodiversity

Chemicals of Life - Importance of chemical components in cells

By the end of the lesson, the learner should be able to:

- Examine packaging labels of common food products to identify chemical components, preservatives, colourings and expiry dates
- Explain the importance of chemical components in cells for growth, energy production and life processes
- Relate food labelling to real life consumer decisions such as checking expiry dates before buying food and reading nutritional information to make healthy dietary choices

In groups, learners are guided to:

- Examine packaging labels of common food products such as mineral water, salt, flour and cooking oil
- Identify the quality marks, preservatives, colourings, date of manufacture and expiry on the labels
- Discuss the importance of knowing the chemical components in food substances for health and safety

Why is it important to know the chemical components in food products?

- Distinction Biology Learner's Book Grade 10 pg. 106
- Packaging labels of common food products
- Digital resources

- Oral questions - Observation - Written assignments

Anatomy and Physiology of Plants

Nutrition - Types of nutrition in plants (Autotrophism and Heterotrophism)
Nutrition - Parasitism as a mode of nutrition in plants

By the end of the lesson, the learner should be able to:

- Describe the meaning of autotrophism and heterotrophism in plants
- Classify plants according to their mode of nutrition
- Recognise that plants in the local environment use different strategies to obtain nutrients

In groups, learners are guided to:
- Search for information from print and non-print media on the types of nutrition in plants and share with peers
- Study pictures showing autotrophic and heterotrophic plants and identify their modes of nutrition
- Discuss the meaning of autotrophism and heterotrophism with classmates

How do plants obtain nutrients from their environment?

- Distinction Biology Learner's Book Grade 10 pg. 107
- Digital resources
- Charts showing autotrophic and heterotrophic plants
- Distinction Biology Learner's Book Grade 10 pg. 109
- Pictures of parasitic plants

- Oral questions - Observation - Written assignments

Anatomy and Physiology of Plants

Nutrition - Saprophytic, symbiotic and insectivorous modes of nutrition
Nutrition - Structure of the chloroplast

By the end of the lesson, the learner should be able to:

- Describe saprophytic, symbiotic and insectivorous modes of nutrition in plants
- Compare and contrast the different heterotrophic modes of nutrition
- Relate the survival strategies of insectivorous plants to nutrient-deficient habitats such as swamps

In groups, learners are guided to:
- Search for information on saprophytic, symbiotic and insectivorous modes of nutrition using print and non-print media
- Study pictures of venus flytrap and pitcher plants and discuss how they trap insects
- Discuss the nutrients obtained by insectivorous plants from insects

Why do some plants trap and digest insects?

- Distinction Biology Learner's Book Grade 10 pg. 110
- Digital resources
- Pictures/charts of insectivorous plants
- Distinction Biology Learner's Book Grade 10 pg. 112
- Charts/diagrams of chloroplast structure

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Plants

Nutrition - Function of the chloroplast in plants
Nutrition - The process of photosynthesis

By the end of the lesson, the learner should be able to:

- Relate the structure of the chloroplast to its function in plant cells
- Explain the role of chlorophyll, grana and stroma in photosynthesis
- Link the abundance of chloroplasts in palisade cells to why the upper leaf surface is the main site for food manufacture

In groups, learners are guided to:
- Discuss the structure of the chloroplast in relation to its function (chlorophyll traps light, grana provide large surface area, stroma has enzymes)
- Use reference materials to search for information on the function of chloroplast in plants

How does the structure of the chloroplast enable it to carry out its function?

- Distinction Biology Learner's Book Grade 10 pg. 113
- Digital resources
- Internet access
- Distinction Biology Learner's Book Grade 10 pg. 114

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Plants

Nutrition - The light stage of photosynthesis
Nutrition - The dark stage of photosynthesis
Nutrition - Comparing the light and dark stages of photosynthesis

By the end of the lesson, the learner should be able to:

- Describe the light (light dependent) stage of photosynthesis
- Illustrate the light stage of photosynthesis using a flow chart
- Explain why plants kept in darkness for extended periods eventually die, linking it to the need for light in photolysis

In groups, learners are guided to:
- Discuss the light stage of photosynthesis including photolysis of water molecules
- Illustrate the light stage using flow charts showing the breakdown of water into hydrogen atoms and oxygen gas
- Identify the site of light stage in the chloroplast (grana)

What happens during the light stage of photosynthesis?

- Distinction Biology Learner's Book Grade 10 pg. 115
- Digital resources
- Charts/flow charts
- Distinction Biology Learner's Book Grade 10 pg. 116
- Charts comparing stages

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Plants

Nutrition - Significance of photosynthesis in nature

By the end of the lesson, the learner should be able to:

- Explain the importance of photosynthesis to plants, animals and the environment
- Discuss how photosynthesis ensures food security in the community
- Connect photosynthesis to combating global warming through tree planting and forest conservation

In groups, learners are guided to:
- Discuss the importance of photosynthesis to plants (food production, energy), animals (oxygen, food chains) and the environment (carbon (IV) oxide removal)
- Explain how photosynthesis helps solve global warming by removing carbon (IV) oxide from the atmosphere
- Discuss how photosynthesis ensures food security

How does photosynthesis benefit both plants and animals?

- Distinction Biology Learner's Book Grade 10 pg. 118
- Digital resources
- Charts on importance of photosynthesis

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Plants

Nutrition - Other products of photosynthesis

By the end of the lesson, the learner should be able to:

- Identify other products of photosynthesis apart from glucose (fatty acids, amino acids)
- Explain the conversion of glucose to starch, fats and proteins in plants
- Relate how plants convert photosynthesis products into nutrients found in everyday foods like beans, avocados and maize

In groups, learners are guided to:
- Discuss how glucose formed during photosynthesis is converted to starch for storage
- Explain the formation of fatty acids (combined to form fats and oils) and amino acids (converted to proteins)
- Search for information on other products of photosynthesis using reference materials

What other substances do plants produce during photosynthesis besides glucose?

- Distinction Biology Learner's Book Grade 10 pg. 117
- Digital resources
- Internet access

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Plants

Nutrition - Assessment and review on nutrition in plants

By the end of the lesson, the learner should be able to:

- Answer questions on types of nutrition, chloroplast structure and photosynthesis
- Illustrate the stages of photosynthesis correctly
- Value the role of photosynthesis in sustaining life on earth by discussing real-life examples like oxygen production and food chains

In groups, learners are guided to:
- Answer assessment exercise questions on nutrition in plants
- Draw and label the chloroplast and identify parts where light and dark stages occur
- Discuss the mode of nutrition shown in given pictures (e.g., mould growing on bread)

How do the different types of nutrition and photosynthesis sustain plant life?

- Distinction Biology Learner's Book Grade 10 pg. 119
- Digital resources
- Past assessment questions

- Written tests - Oral questions - Observation

Anatomy and Physiology of Plants

Transport - External structures of the plant transport system
Transport - Structure and function of roots in transport

By the end of the lesson, the learner should be able to:

- State the external parts of a plant that form the transport system (roots, stems, leaves)
- Identify the substances transported by each external part
- Relate the transport system in plants to how water reaches the topmost leaves of tall trees in the local environment

In groups, learners are guided to:
- Discuss the structures of external parts of a plant in relation to their transport functions
- Identify substances transported within the plant (water, mineral salts, food substances and waste products)
- Search for information on the external structures of plants that transport substances

What external structures make up the transport system in plants?

- Distinction Biology Learner's Book Grade 10 pg. 120
- Digital resources
- Fresh plant specimens
- Distinction Biology Learner's Book Grade 10 pg. 121
- Charts of root structure

- Oral questions - Observation - Written assignments

Anatomy and Physiology of Plants

Transport - Internal structure of the root (transverse section)
Transport - Structure and function of stems in transport
Transport - Structure and function of leaves in transport

By the end of the lesson, the learner should be able to:

- Describe the internal tissues of the root (piliferous layer, cortex, endodermis, pericycle, vascular tissues)
- Relate the structure of each tissue to its function
- Explain how the casparian strip in the endodermis acts like a filter to protect the plant from absorbing harmful substances

In groups, learners are guided to:
- Study the transverse section of monocotyledonous and dicotyledonous roots
- Identify and describe the piliferous layer, cortex, endodermis (casparian strip), pericycle and vascular tissues
- Discuss the function of each tissue in the root

How do the internal tissues of the root facilitate water and mineral salt absorption?

- Distinction Biology Learner's Book Grade 10 pg. 123
- Digital resources
- Charts/photomicrographs of root cross-sections
- Distinction Biology Learner's Book Grade 10 pg. 125
- Fresh plant stems
- Charts of stem cross-sections
- Distinction Biology Learner's Book Grade 10 pg. 127
- Fresh plant leaves

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Plants

Transport - Structure, functions and adaptations of xylem vessels
Transport - Structure, functions and adaptations of phloem tissue

By the end of the lesson, the learner should be able to:

- Describe the structure and adaptations of xylem vessels and tracheids
- Explain how xylem vessels are adapted to transport water and mineral salts
- Relate the lignin deposits in xylem walls to why woody stems are rigid and do not collapse easily

In groups, learners are guided to:
- Study diagrams of xylem vessels and tracheids and discuss their structure
- Discuss the adaptations of xylem to its function (continuous tube, lignified walls, pits, dead cells)
- Search for information on the structure and adaptations of xylem vessels

How are xylem vessels adapted to transport water in plants?

- Distinction Biology Learner's Book Grade 10 pg. 129
- Digital resources
- Charts/diagrams of xylem vessels
- Distinction Biology Learner's Book Grade 10 pg. 131
- Charts/diagrams of phloem tissue

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Plants

Transport - Arrangement of vascular tissues in roots of monocots and dicots (Practical)
Transport - Arrangement of vascular tissues in stems of monocots and dicots (Practical)

By the end of the lesson, the learner should be able to:

- Observe and draw cross-sections of monocotyledonous and dicotyledonous roots under a microscope
- Compare the arrangement of vascular tissues in roots of monocots and dicots
- Handle laboratory apparatus such as microscopes and scalpels safely and responsibly

In groups, learners are guided to:
- Cut thin cross-sections of monocotyledonous and dicotyledonous roots, stain with iodine solution and observe under a microscope
- Draw well-labelled cross-sectional drawings of monocot and dicot roots
- Compare the arrangement of vascular tissues in the two types of roots

How does the arrangement of vascular tissues differ in roots of monocots and dicots?

- Distinction Biology Learner's Book Grade 10 pg. 133
- Light microscope
- Fresh plant roots
- Iodine solution, scalpel, glass slides, cover slips
- Distinction Biology Learner's Book Grade 10 pg. 135
- Fresh plant stems

- Observation - Practical assessment - Written assignments

Anatomy and Physiology of Plants

Transport - Mechanisms of water uptake in plants (osmosis and active transport)

By the end of the lesson, the learner should be able to:

- Describe the mechanisms of water uptake in plants (osmosis, active transport)
- Explain how water moves from soil particles to the xylem vessels in the root
- Relate osmosis in root hair cells to why plants wilt when placed in very salty soil

In groups, learners are guided to:
- Search for information on mechanisms of water and mineral salt uptake in plants
- Study diagrams showing the absorption of water by plant roots
- Discuss how water moves from the soil particles through the root hair cells to the xylem vessels by osmosis

How does water move from the soil into the root of a plant?

- Distinction Biology Learner's Book Grade 10 pg. 137
- Digital resources
- Charts showing water absorption in plants

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Plants

Transport - Movement of water up the plant (transpiration pull, cohesion, adhesion, capillarity, root pressure)

By the end of the lesson, the learner should be able to:

- Explain the forces that move water up the plant (transpiration pull, cohesion, adhesion, capillarity and root pressure)
- Describe how each force contributes to the upward movement of water
- Relate capillary action in xylem vessels to how water moves up a piece of cloth dipped in water

In groups, learners are guided to:
- Discuss transpiration pull, cohesion forces, adhesion forces, capillarity and root pressure
- Watch animations on the uptake of water and mineral salts in plants
- Explain how exudation and guttation occur in plants

What forces enable water to move from the roots to the leaves against gravity?

- Distinction Biology Learner's Book Grade 10 pg. 139
- Digital resources
- Internet access

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Plants

Transport - Absorption of mineral salts and demonstrating water uptake (Practical)

By the end of the lesson, the learner should be able to:

- Explain the mechanism of mineral salt absorption (active transport and diffusion)
- Carry out an experiment to demonstrate uptake of water in plants using dye/ink
- Handle chemicals like food colouring safely and dispose of waste materials responsibly after the experiment

In groups, learners are guided to:
- Discuss how mineral salts are absorbed by active transport and diffusion
- Carry out a dye/ink experiment to demonstrate uptake of water in plants
- Observe exudation and guttation in the experimental set-up and draw conclusions

How are mineral salts absorbed by plant roots?

- Distinction Biology Learner's Book Grade 10 pg. 141
- Fresh young plants
- Food colouring/ink
- Glass beaker, scalpel, distilled water

- Practical assessment - Observation - Written assignments

Anatomy and Physiology of Plants

Transport - The process of transpiration

By the end of the lesson, the learner should be able to:

- Define transpiration and describe how it occurs through the stomata
- Relate the internal structure of the leaf to the process of transpiration
- Explain why clothes dry faster on a sunny windy day, linking it to how transpiration increases under similar conditions

In groups, learners are guided to:
- Discuss the process of transpiration and how water vapour diffuses out through the stomata
- Study the internal structure of the leaf and relate it to transpiration (spongy mesophyll, sub-stomatal air spaces, guard cells)
- Discuss the role of guard cells in controlling the opening and closing of stomata

How does transpiration occur in plant leaves?

- Distinction Biology Learner's Book Grade 10 pg. 143
- Digital resources
- Charts of leaf internal structure

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Plants

Transport - Structural factors affecting the rate of transpiration

By the end of the lesson, the learner should be able to:

- Describe the structural factors that affect the rate of transpiration (leaf size, leaf surface, number and position of stomata, leaf hairs)
- Explain how each structural factor affects transpiration rate
- Explain why cactus plants survive in arid areas by relating their leaf structure to reduced water loss

In groups, learners are guided to:
- Discuss structural factors affecting the rate of transpiration (broad lamina, glossy surface, number of stomata, sunken stomata, leaf hairs)
- Explain midday closure and reversed stomatal rhythm
- Search for information on structural factors using available reference materials

How do leaf structures influence the rate of water loss in plants?

- Distinction Biology Learner's Book Grade 10 pg. 145
- Digital resources
- Internet access

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Plants

Transport - Environmental factors affecting the rate of transpiration (Temperature and light intensity practicals)

By the end of the lesson, the learner should be able to:

- Carry out experiments to demonstrate the effect of temperature and light intensity on transpiration
- Explain how temperature and light intensity affect the rate of transpiration
- Set up a control experiment and explain its purpose in ensuring valid results

In groups, learners are guided to:
- Carry out an experiment using a heat bulb to demonstrate the effect of temperature on transpiration
- Carry out an experiment using a light bulb to demonstrate the effect of light intensity on transpiration
- Compare condensation on plastic bottles/carrier bags in both experiments and draw conclusions

How do temperature and light intensity affect the rate of transpiration?

- Distinction Biology Learner's Book Grade 10 pg. 147
- Potted plants
- Heat bulb, light bulb
- Transparent carrier bags, elastic bands

- Practical assessment - Observation - Written assignments

Anatomy and Physiology of Plants

Transport - Environmental factors affecting the rate of transpiration (Wind practical and other factors)

By the end of the lesson, the learner should be able to:

- Carry out an experiment to demonstrate the effect of wind on transpiration
- Describe how humidity, atmospheric pressure and water availability affect transpiration
- Improvise a fan from locally available materials, demonstrating creativity and resourcefulness

In groups, learners are guided to:
- Carry out an experiment using an improvised fan to demonstrate the effect of wind on transpiration
- Discuss how humidity, atmospheric pressure and water availability in the soil affect the rate of transpiration
- Compare water droplets on carrier bags of potted plants near and far from the fan

How do wind, humidity and water availability affect the rate of transpiration?

- Distinction Biology Learner's Book Grade 10 pg. 149
- Potted plants
- Improvised fan materials
- Transparent carrier bags, elastic bands

- Practical assessment - Observation - Written assignments

Anatomy and Physiology of Plants

Transport - Translocation of manufactured food in plants
Transport - Demonstrating translocation by bark ringing and significance of transport in plants

By the end of the lesson, the learner should be able to:

- Define translocation and describe the process in plants
- Identify the materials transported during translocation (sucrose, amino acids, vitamins)
- Relate translocation to why fruits, roots and seeds store food, as seen in everyday crops like sugarcane and sweet potatoes

In groups, learners are guided to:
- Discuss the process of translocation of manufactured food from the leaves to other parts of the plant
- Watch animations on translocation and share with peers
- Identify the vascular tissues (phloem) involved in translocation

How is manufactured food transported from the leaves to other parts of the plant?

- Distinction Biology Learner's Book Grade 10 pg. 151
- Digital resources
- Internet access
- Distinction Biology Learner's Book Grade 10 pg. 153
- Young tree/woody plant
- Knife, permanent marker pen
- Digital device for recording

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Plants

Gaseous Exchange and Respiration - Meaning and significance of gaseous exchange in plants
Gaseous Exchange and Respiration - Stomata as a site for gaseous exchange (Practical)

By the end of the lesson, the learner should be able to:

- Define gaseous exchange in plants
- Explain the significance of gaseous exchange to plants and the environment
- Relate gaseous exchange to why indoor plants help improve air quality in homes and classrooms

In groups, learners are guided to:
- Search for information on the meaning of gaseous exchange and discuss with peers
- Identify the respiratory gases (oxygen and carbon (IV) oxide) and their movement during the day and at night
- Discuss the significance of gaseous exchange to plants (photosynthesis, respiration, transpiration) and the environment (balance of atmospheric gases, air purification)

Why is gaseous exchange important to plants and the environment?

- Distinction Biology Learner's Book Grade 10 pg. 151
- Digital resources
- Internet access
- Distinction Biology Learner's Book Grade 10 pg. 155
- Fresh plant leaves
- Clear nail polish
- Light microscope, glass slides, cover slips

- Oral questions - Observation - Written assignments

Anatomy and Physiology of Plants

Gaseous Exchange and Respiration - Distribution of stomata in different plant habitats
Gaseous Exchange and Respiration - Lenticels as gaseous exchange sites in stems

By the end of the lesson, the learner should be able to:

- Describe the distribution of stomata in xerophytes, hydrophytes and mesophytes
- Investigate the number, size and distribution of stomata in leaves from different habitats
- Explain why water lilies have stomata on the upper surface while desert plants have few sunken stomata on the lower surface

In groups, learners are guided to:
- Collect fresh leaves from plants in different habitats and observe stomatal distribution under a microscope
- Count the number of stomata and observe their sizes and distribution on both sides of the leaf
- Discuss adaptations of stomata in xerophytes (few, sunken, thick cuticle), hydrophytes (numerous, upper epidermis) and mesophytes (evenly distributed)

How does the habitat of a plant influence the distribution of stomata on its leaves?

- Distinction Biology Learner's Book Grade 10 pg. 157
- Fresh leaf samples from different habitats
- Light microscope, nail polish
- Glass slides, cover slips
- Distinction Biology Learner's Book Grade 10 pg. 161
- Photomicrographs of lenticels
- Digital resources

- Practical assessment - Observation - Written assignments

Anatomy and Physiology of Plants

Gaseous Exchange and Respiration - Pneumatophores as gaseous exchange sites in roots
Gaseous Exchange and Respiration - Photosynthetic theory of stomatal opening and closing

By the end of the lesson, the learner should be able to:

- Describe the structure and adaptations of pneumatophores for gaseous exchange
- Explain the mechanism of gaseous exchange through pneumatophores
- Relate pneumatophores to the visible breathing roots of mangrove trees growing in swampy areas along the Kenyan coast

In groups, learners are guided to:
- Study photographs/diagrams of pneumatophores and discuss their structure (lenticels, aerenchyma tissues)
- Discuss how pneumatophores grow above the water level to obtain oxygen from the atmosphere
- Explain the role of aerenchyma tissues in storing air for gaseous exchange

How do plants in waterlogged areas carry out gaseous exchange?

- Distinction Biology Learner's Book Grade 10 pg. 163
- Photomicrographs/pictures of pneumatophores
- Digital resources
- Distinction Biology Learner's Book Grade 10 pg. 165
- Digital resources
- Charts showing open and closed stomata

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Plants

Gaseous Exchange and Respiration - Starch-sugar inter-conversion theory
Gaseous Exchange and Respiration - Potassium ion theory of stomatal opening and closing

By the end of the lesson, the learner should be able to:

- Describe the mechanism of opening and closing of stomata using the starch-sugar inter-conversion theory
- Explain the role of pH in the conversion of starch to glucose and vice versa
- Connect how changes in carbon (IV) oxide levels during day and night trigger a chain reaction that opens or closes stomata

In groups, learners are guided to:
- Discuss how during the day, carbon (IV) oxide is used for photosynthesis causing pH to rise favouring conversion of starch to glucose
- Explain how glucose increases osmotic pressure of guard cells causing water uptake and stomata to open
- Discuss the reverse process at night when carbon (IV) oxide accumulates lowering pH

How does the conversion between starch and sugar control stomatal opening?

- Distinction Biology Learner's Book Grade 10 pg. 167
- Digital resources
- Internet access
- Distinction Biology Learner's Book Grade 10 pg. 168
- Internet access
- Charts comparing the three theories

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Plants

Gaseous Exchange and Respiration - The process of respiration and aerobic respiration
Gaseous Exchange and Respiration - Anaerobic respiration in plants

By the end of the lesson, the learner should be able to:

- Define respiration and state the word equation for aerobic respiration
- Describe the stages of aerobic respiration (glycolysis and Kreb's cycle)
- Connect aerobic respiration to why living cells need a constant supply of oxygen to release energy for growth and repair

In groups, learners are guided to:
- Search for information on the process of respiration and discuss with peers
- Identify the cell organelle where respiration occurs (mitochondria)
- Discuss aerobic respiration including glycolysis (cytoplasm) and Kreb's cycle (matrix of mitochondria)

How do plants break down glucose to release energy?

- Distinction Biology Learner's Book Grade 10 pg. 169
- Digital resources
- Internet access
- Distinction Biology Learner's Book Grade 10 pg. 171

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Plants

Gaseous Exchange and Respiration - Investigating aerobic and anaerobic respiration (Practical)

By the end of the lesson, the learner should be able to:

- Carry out experiments to distinguish between aerobic and anaerobic respiration
- Explain the role of calcium hydroxide solution and paraffin in the experiments
- Observe safety precautions when handling chemicals and dispose of waste materials appropriately after the experiment

In groups, learners are guided to:
- Set up experiments using germinating bean seeds to demonstrate aerobic respiration (test tube A) and boiled bean seeds to demonstrate anaerobic respiration (test tube B)
- Observe the colour change of calcium hydroxide solution and record temperature readings
- Discuss the role of paraffin in blocking oxygen entry

How can aerobic and anaerobic respiration be demonstrated experimentally?

- Distinction Biology Learner's Book Grade 10 pg. 172
- Germinating and boiled bean seeds
- Test tubes, delivery tubes, rubber stoppers
- Calcium hydroxide solution, paraffin, glucose solution

- Practical assessment - Observation - Written assignments

Anatomy and Physiology of Plants

Gaseous Exchange and Respiration - Economic importance of anaerobic respiration

By the end of the lesson, the learner should be able to:

- Explain the economic importance of anaerobic respiration in various industries
- Describe how anaerobic respiration is applied in brewing, baking, dairy and biogas production
- Relate anaerobic respiration to locally made products like yoghurt, cheese, bread and traditional fermented drinks

In groups, learners are guided to:
- Discuss the economic importance of anaerobic respiration in brewing, baking, biogas production, dairy industry, sewage treatment, silage formation, pharmaceutical industry and compost manure production
- Explain how yeast breaks down sugars anaerobically in brewing and baking
- Discuss how bacteria produce lactic acid in dairy products

How is anaerobic respiration applied in everyday industries and products?

- Distinction Biology Learner's Book Grade 10 pg. 174
- Digital resources
- Charts showing applications of anaerobic respiration

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Plants

Gaseous Exchange and Respiration - Biogas production project

By the end of the lesson, the learner should be able to:

- Demonstrate anaerobic respiration through a biogas production project
- Describe the procedure and observations in biogas production
- Relate biogas production to waste management and renewable energy solutions in rural Kenyan communities

In groups, learners are guided to:
- Set up a simple biogas digester using organic waste and water in a sealed container
- Observe balloon inflation over 5-7 days as biogas is produced
- Test the collected gas by bringing it near a flame and observing the blue flame

How can anaerobic respiration be harnessed for biogas production?

- Distinction Biology Learner's Book Grade 10 pg. 175
- Large plastic bottle/container
- Organic waste, water
- Rubber tubing, balloon, tape

- Project assessment - Observation - Written report

Anatomy and Physiology of Plants

Gaseous Exchange and Respiration - Significance of gaseous exchange and respiration to plants and the environment
Gaseous Exchange and Respiration - Assessment and review on gaseous exchange and respiration

By the end of the lesson, the learner should be able to:

- Outline the significance of gaseous exchange and respiration to plants and the environment
- Design a portfolio illustrating the significance of gaseous exchange and respiration
- Relate the significance of gaseous exchange to why deforestation contributes to climate change and why reforestation is encouraged

In groups, learners are guided to:
- Discuss the significance of gaseous exchange and respiration to plants (energy production, growth, photosynthesis) and the environment (oxygen supply, carbon cycling, temperature regulation)
- Design a portfolio illustrating the significance of gaseous exchange and respiration
- Show portfolios to peers for assessment

How do gaseous exchange and respiration contribute to the survival of plants and the environment?

- Distinction Biology Learner's Book Grade 10 pg. 177
- Digital resources
- Portfolio materials
- Distinction Biology Learner's Book Grade 10 pg. 178
- Past assessment questions

- Portfolio assessment - Oral questions - Observation