Cell Biology and Biodiversity

Structure of plant cells as seen under electron microscope

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

- Describe the structure of plant cells as seen under electron microscope
- Draw and label plant cell organelles
- Relate plant cell structure to functions like photosynthesis which produces food and oxygen for human survival

- Study photomicrographs or charts of plant cells under electron microscope
- Identify and label organelles: cell wall, cell membrane, nucleus, chloroplast, mitochondria, vacuole, endoplasmic reticulum, golgi apparatus, ribosomes
- Draw and label plant cell structure

What structures are visible in a plant cell under an electron microscope?

- Spotlight Biology Learner's Book pg. 38
- Photomicrographs of plant cells
- Charts, models

- Oral questions - Drawing assessment - Written assignments

Cell Biology and Biodiversity

Structure of animal cells as seen under electron microscope
Functions of cell organelles

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

- Describe the structure of animal cells as seen under electron microscope
- Draw and label animal cell organelles
- Connect animal cell structure to body functions like muscle contraction and nerve impulse transmission

- Study photomicrographs or charts of animal cells under electron microscope
- Identify and label organelles: cell membrane, nucleus, cytoplasm, mitochondria, endoplasmic reticulum, golgi apparatus, ribosomes, lysosomes, centrioles
- Draw and label animal cell structure

What structures are visible in an animal cell under an electron microscope?

- Spotlight Biology Learner's Book pg. 40
- Photomicrographs of animal cells
- Charts, models
- Spotlight Biology Learner's Book pg. 43
- Charts showing organelle functions
- Digital resources

- Oral questions - Drawing assessment - Written assignments

Cell Biology and Biodiversity

Comparing plant and animal cells

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

- Compare plant and animal cells as seen under electron microscope
- Identify similarities and differences between the two cell types
- Relate cell differences to why plants are rigid and animals are flexible

- Use photomicrographs to compare plant and animal cells
- Discuss similarities: cell membrane, nucleus, cytoplasm, mitochondria, ribosomes
- Discuss differences: cell wall, chloroplasts, vacuole size, centrioles
- Complete comparison tables

Why do plant and animal cells differ in structure?

- Spotlight Biology Learner's Book pg. 47
- Photomicrographs
- Comparison charts

- Oral questions - Table completion - Written assignments

Cell Biology and Biodiversity

Specialised cells in plants

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

- Identify specialised cells in plants
- Relate structure of specialised plant cells to their functions
- Connect plant cell specialisation to agricultural practices like improving water absorption and photosynthesis efficiency in crops

- Study photomicrographs or diagrams of root hair cells, guard cells, palisade cells, pollen grains
- Discuss adaptations of each cell type to its function
- Draw and label specialised plant cells

How are plant cells modified to perform specific functions?

- Spotlight Biology Learner's Book pg. 48
- Photomicrographs
- Charts of specialised cells

- Oral questions - Drawing assessment - Written tests

Cell Biology and Biodiversity

Specialised cells in animals

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

- Identify specialised cells in animals
- Relate structure of specialised animal cells to their functions
- Connect cell specialisation to health conditions like anaemia (red blood cells) and muscle weakness (muscle cells)

- Study photomicrographs or diagrams of muscle cells, nerve cells, red blood cells, white blood cells, sperm cells, ova
- Discuss adaptations of each cell type to its function
- Draw and label specialised animal cells

How are animal cells modified to perform specific functions?

- Spotlight Biology Learner's Book pg. 52
- Photomicrographs
- Charts of specialised cells

- Oral questions - Drawing assessment - Written assignments

Cell Biology and Biodiversity

Levels of organisation - Cell to organism
Introduction to chemicals of life

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

- Describe levels of organisation in organisms
- Arrange levels from lowest to highest: organelle, cell, tissue, organ, organ system, organism
- Relate levels of organisation to how body systems like digestive and circulatory systems work together to maintain health

- Discuss levels of organisation: organelles, cells, tissues, organs, organ systems, organisms
- Identify examples at each level
- Arrange levels in correct order from lowest to highest
- Give examples of tissues in plants and animals

How are cells organised to form a complete organism?

- Spotlight Biology Learner's Book pg. 55
- Charts showing levels of organisation
- Digital resources
- Spotlight Biology Learner's Book pg. 61
- Digital resources
- Charts

- Oral questions - Sequencing exercises - Written tests

Cell Biology and Biodiversity

Carbohydrates - Monosaccharides and disaccharides
Carbohydrates - Polysaccharides

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

- Describe the composition and properties of monosaccharides and disaccharides
- Explain the functions of simple sugars
- Relate carbohydrates to energy-giving foods like ugali, rice, bread, and fruits consumed daily

- Search for information on carbohydrates
- Discuss composition: carbon, hydrogen, oxygen with formula (CH₂O)n
- Discuss types: monosaccharides (glucose, fructose), disaccharides (sucrose, maltose, lactose)
- Explain condensation and hydrolysis reactions

Why are carbohydrates called energy-giving foods?

- Spotlight Biology Learner's Book pg. 63
- Food samples
- Charts showing carbohydrate types
- Spotlight Biology Learner's Book pg. 65
- Samples of starchy foods
- Charts

- Oral questions - Written assignments - Group discussions

Cell Biology and Biodiversity

Lipids - Composition and properties
Lipids - Functions and Proteins
Enzymes - Properties and functions
Vitamins and mineral salts

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

- Describe the composition and properties of lipids
- Investigate properties of lipids through experiments
- Relate lipids to cooking oils, butter, and body fat that provides insulation and energy storage

- Describe the properties of enzymes
- Explain the functions of enzymes in living organisms
- Relate enzymes to digestion of food in the stomach and use of enzymes in laundry detergents

- Investigate physical state of cooking fat and oil
- Test solubility of lipids in water and ethanol
- Perform grease spot test
- Discuss composition: fatty acids and glycerol forming triglycerides
- Search for information on enzymes
- Discuss properties: protein in nature, destroyed by high temperatures and extreme pH, specific to substrates, remain unchanged after reaction
- Explain enzyme-substrate specificity using lock and key model

What are the properties of fats and oils?
How do enzymes help in digestion of food?

- Spotlight Biology Learner's Book pg. 66
- Cooking oil, cooking fat, ethanol
- Filter paper, test tubes
- Spotlight Biology Learner's Book pg. 68
- Food samples rich in protein
- Charts
- Spotlight Biology Learner's Book pg. 70
- Charts showing enzyme action
- Digital resources
- Spotlight Biology Learner's Book pg. 72
- Pictures of foods
- Charts of vitamins and minerals

- Practical assessment - Observation - Written assignments
- Oral questions - Written tests - Diagrams

Cell Biology and Biodiversity

Water - Properties and functions
Testing for starch and reducing sugars

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

- Describe the properties of water
- Explain the functions of water in living organisms
- Relate water functions to daily needs like drinking, sweating for cooling, and transport of nutrients in blood

- Investigate properties of water: colourless, odourless, density, boiling point
- Discuss functions: solvent, transport medium, cooling through sweating, medium for chemical reactions, osmoregulation

Why is water essential for survival of living organisms?

- Spotlight Biology Learner's Book pg. 76
- Distilled water, beakers
- Thermometer, heat source
- Spotlight Biology Learner's Book pg. 79
- Iodine solution, Benedict's solution
- Food samples, test tubes, heat source

- Practical assessment - Oral questions - Written tests

Cell Biology and Biodiversity

Testing for non-reducing sugars and proteins

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

- Test for the presence of non-reducing sugars in food substances
- Test for the presence of proteins using Biuret test
- Apply food tests to verify nutritional claims on food packaging labels

- Perform test for non-reducing sugars using hydrolysis with dilute HCl followed by Benedict's test
- Perform Biuret test for proteins: purple/violet colour indicates presence
- Record and interpret results

How can non-reducing sugars and proteins be detected in food?

- Spotlight Biology Learner's Book pg. 82
- Benedict's solution, dilute HCl
- Sodium hydroxide, copper sulphate solution

- Practical assessment - Observation - Written reports

Cell Biology and Biodiversity

Testing for lipids and vitamin C

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

- Test for the presence of lipids using grease spot and emulsion tests
- Test for the presence of vitamin C using DCPIP
- Apply lipid and vitamin tests to evaluate nutritional quality of cooking oils and fruit juices

- Perform grease spot test: translucent spot indicates lipids
- Perform emulsion test: white emulsion indicates lipids
- Perform DCPIP test for vitamin C: decolourisation indicates presence
- Compare vitamin C content in different fruits

How can lipids and vitamin C be detected in food substances?

- Spotlight Biology Learner's Book pg. 84
- Filter paper, ethanol, DCPIP
- Cooking oil, fruit juices

- Practical assessment - Observation - Written reports

Cell Biology and Biodiversity
Anatomy and Physiology of Plants

Presence of enzymes and factors affecting enzyme activity
Nutrition - Autotrophic nutrition
Nutrition - Heterotrophic nutrition (Parasitic mode)

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

- Investigate presence of catalase enzyme in living tissues
- Determine factors affecting enzyme activity
- Relate enzyme activity to food spoilage, digestion efficiency, and industrial enzyme use in brewing and baking

- Define autotrophic nutrition
- Describe how autotrophic plants manufacture their own food
- Recognize the importance of green plants in food production for ecosystems

- Investigate presence of catalase using hydrogen peroxide and liver/potato
- Investigate effect of temperature on enzyme activity
- Investigate effect of pH on enzyme activity
- Investigate effect of substrate and enzyme concentration
- Search for information on types of nutrition in plants from print and non-print resources
- Discuss the meaning of autotrophic nutrition and share with peers
- Use digital devices to watch videos on how plants manufacture food

What factors affect how fast enzymes work?
How do plants obtain their food?

- Spotlight Biology Learner's Book pg. 87
- Hydrogen peroxide, liver, potato
- Amylase, starch, pepsin, egg albumen
- Spotlight Biology Learner's Book Grade 10 pg. 98
- Digital resources
- Charts showing plant nutrition
- Pictures of parasitic plants
- Digital resources

- Practical assessment - Observation - Written reports
- Oral questions - Observation - Written assignments

Anatomy and Physiology of Plants

Nutrition - Heterotrophic nutrition (Saprophytic mode)
Nutrition - Heterotrophic nutrition (Symbiotic mode)

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

- Describe saprophytic mode of nutrition in plants
- Explain how saprophytes break down dead organic matter
- Connect the role of saprophytes to nutrient recycling and soil fertility in farming

- Study photographs of saprophytic plants like Indian pipe and Ghost orchid
- Discuss how saprophytes release enzymes to break down organic matter
- Search for information on importance of saprophytes in the environment

Why are saprophytic plants important to the ecosystem?

- Spotlight Biology Learner's Book Grade 10 pg. 99
- Pictures of saprophytic plants
- Reference books
- Spotlight Biology Learner's Book Grade 10 pg. 100
- Fresh specimens of legume roots with nodules
- Charts showing symbiosis

- Written assignments - Oral questions - Observation

Anatomy and Physiology of Plants

Nutrition - Heterotrophic nutrition (Insectivorous mode)
Nutrition - Structure of the chloroplast

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

- Describe insectivorous mode of nutrition in plants
- Identify adaptations of insectivorous plants for trapping insects
- Link the unique feeding strategies of carnivorous plants to survival in nutrient-poor soils

- Study photographs of Venus flytrap, pitcher plant and sundew
- Discuss mechanisms used by insectivorous plants to trap and digest prey
- Watch videos showing how insectivorous plants capture insects

How do insectivorous plants trap and digest their prey?

- Spotlight Biology Learner's Book Grade 10 pg. 101
- Pictures of insectivorous plants
- Video clips
- Digital resources
- Spotlight Biology Learner's Book Grade 10 pg. 103
- Photomicrographs of chloroplasts
- Charts

- Oral questions - Group discussions - Written assignments

Anatomy and Physiology of Plants

Nutrition - Functions of chloroplast parts
Nutrition - Introduction to photosynthesis

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

- Relate each part of the chloroplast to its function
- Explain how the structure of chloroplast enables photosynthesis
- Connect chloroplast function to how plants produce the oxygen we breathe and food we eat

- Discuss the functions of grana, stroma, thylakoids and ribosomes
- Search for information on how chloroplast structure relates to function
- Model the structure of chloroplast using locally available materials

How does the structure of chloroplast relate to its function in photosynthesis?

- Spotlight Biology Learner's Book Grade 10 pg. 104
- Models of chloroplasts
- Reference books
- Digital resources
- Charts showing photosynthesis equation

- Written assignments - Oral questions - Model assessment

Anatomy and Physiology of Plants

Nutrition - Light stage of photosynthesis
Nutrition - Dark stage of photosynthesis

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

- Describe the light stage (photolysis) of photosynthesis
- Explain the role of sunlight in splitting water molecules
- Connect light reactions to how solar energy is captured and converted in nature

- Describe the dark stage (carbon fixation) of photosynthesis
- Explain how glucose is formed from carbon dioxide and hydrogen ions
- Relate glucose production to how plants store energy that later becomes our food source

- Watch animations showing the light stage of photosynthesis
- Discuss how water molecules are split to produce hydrogen ions and oxygen
- Illustrate the light stage using flow charts
- Watch animations showing the dark stage of photosynthesis
- Discuss the role of enzymes in the stroma during carbon fixation
- Compare and contrast light and dark stages of photosynthesis

What happens during the light stage of photosynthesis?
How is glucose formed during the dark stage of photosynthesis?

- Spotlight Biology Learner's Book Grade 10 pg. 105
- Animations/video clips
- Charts
- Digital resources
- Spotlight Biology Learner's Book Grade 10 pg. 106
- Animations/video clips
- Flow charts
- Digital resources

- Oral questions - Written tests - Diagram labelling
- Written assignments - Oral questions - Observation

Anatomy and Physiology of Plants

Nutrition - Importance of photosynthesis to plants

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

- Explain the significance of photosynthesis to plants
- Describe how photosynthesis provides food and energy for plant growth
- Connect photosynthesis to food security and agricultural productivity

- Discuss the importance of photosynthesis in providing food for plants
- Search for information on how photosynthesis supports plant growth and development
- Share findings with classmates for peer assessment

Why is photosynthesis essential for plant survival?

- Spotlight Biology Learner's Book Grade 10 pg. 106
- Reference books
- Digital resources

- Oral questions - Written assignments - Group presentations

Anatomy and Physiology of Plants

Nutrition - Importance of photosynthesis to the environment

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

- Explain the significance of photosynthesis to the environment
- Describe how photosynthesis releases oxygen and reduces carbon dioxide levels
- Relate photosynthesis to combating climate change and maintaining breathable air for all living organisms

- Discuss the role of photosynthesis in producing oxygen for respiration
- Explain how plants absorb carbon dioxide and help control climate change
- Encourage tree planting as a way of maximizing benefits of photosynthesis

How does photosynthesis benefit the environment and living organisms?

- Spotlight Biology Learner's Book Grade 10 pg. 107
- Charts
- Digital resources
- Reference books

- Written tests - Oral questions - Project work

Anatomy and Physiology of Plants

Transport - External structures of a plant

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

- Identify the external parts of a plant (roots, stem, leaves)
- Describe the functions of each external plant part
- Relate plant structures to how plants obtain water, nutrients and produce food for human consumption

- Examine freshly uprooted herbaceous plants
- Draw well-labelled diagrams showing parts of a plant
- Discuss the functions of roots, stems and leaves in transport

What are the main parts of a plant and their functions in transport?

- Spotlight Biology Learner's Book Grade 10 pg. 110
- Fresh plant specimens
- Hand lens
- Charts

- Observation - Oral questions - Practical assessment

Anatomy and Physiology of Plants

Transport - Adaptations of roots to their functions
Transport - Adaptations of stems and leaves

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

- Describe the adaptations of roots to their functions
- Explain the role of root hairs in absorption of water and mineral salts
- Connect root structure to how plants access groundwater even during dry seasons

- Describe the adaptations of stems and leaves to their functions
- Explain how vascular tissues in stems transport materials
- Relate leaf structure to how plants capture sunlight for food production

- Study diagrams of longitudinal sections of root tips
- Discuss how root hairs increase surface area for absorption
- Examine fresh specimens of roots under a hand lens
- Discuss how stems contain xylem and phloem for transport
- Explain adaptations of leaves including broad lamina and waxy cuticle
- Search for information on structural adaptations of plant parts

How are roots adapted for absorption of water and mineral salts?
How are stems and leaves adapted for their functions?

- Spotlight Biology Learner's Book Grade 10 pg. 111
- Fresh root specimens
- Hand lens
- Charts showing root structure
- Spotlight Biology Learner's Book Grade 10 pg. 111
- Plant specimens
- Charts
- Digital resources

- Oral questions - Written assignments - Observation
- Written assignments - Oral questions - Observation

Anatomy and Physiology of Plants

Transport - Arrangement of vascular tissues in dicotyledonous roots

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

- Describe the arrangement of vascular tissues in dicotyledonous roots
- Prepare and observe transverse sections of dicotyledonous roots
- Identify how vascular arrangement enables efficient water transport in common crops like beans

- Cut thin transverse sections of bean roots
- Mount sections on slides and observe under microscope
- Draw and label cross-sections of dicotyledonous roots

How are vascular tissues arranged in dicotyledonous roots?

- Spotlight Biology Learner's Book Grade 10 pg. 113
- Bean seedlings
- Light microscope
- Scalpels
- Slides and cover slips

- Practical assessment - Observation - Oral questions

Anatomy and Physiology of Plants

Transport - Arrangement of vascular tissues in monocotyledonous roots

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

- Describe the arrangement of vascular tissues in monocotyledonous roots
- Compare vascular arrangement in monocot and dicot roots
- Distinguish between maize and bean root structures commonly found in Kenyan farms

- Cut thin transverse sections of maize roots
- Mount sections on slides and observe under microscope
- Compare and contrast monocot and dicot root structures

How does vascular tissue arrangement differ in monocot and dicot roots?

- Spotlight Biology Learner's Book Grade 10 pg. 114
- Maize seedlings
- Light microscope
- Scalpels
- Slides and cover slips

- Practical assessment - Written assignments - Observation

Anatomy and Physiology of Plants

Transport - Arrangement of vascular tissues in dicotyledonous stems
Transport - Arrangement of vascular tissues in monocotyledonous stems

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

- Describe the arrangement of vascular tissues in dicotyledonous stems
- Observe permanent slides of dicotyledonous stems
- Relate vascular bundle arrangement to growth patterns in trees and shrubs

- Mount permanent slides of dicotyledonous stems on microscope
- Observe and draw cross-sections of dicotyledonous stems
- Identify epidermis, cortex, vascular bundles and pith

How are vascular tissues arranged in dicotyledonous stems?

- Spotlight Biology Learner's Book Grade 10 pg. 115
- Permanent slides
- Light microscope
- Charts
- Spotlight Biology Learner's Book Grade 10 pg. 116

- Practical assessment - Oral questions - Observation

Anatomy and Physiology of Plants

Transport - Mechanisms of water absorption
Transport - Root pressure and capillarity

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

- Explain mechanisms of water and mineral salt uptake in plants
- Describe the role of osmosis in water absorption by root hairs
- Connect plant water absorption to how irrigation helps crops grow in dry areas

- Explain root pressure as a force that moves water up the plant
- Describe capillarity and its role in water transport
- Relate root pressure to early morning water droplets (guttation) observed on plant leaves

- Search for information on mechanisms of water uptake in plants
- Discuss how water moves from soil into root hair cells by osmosis
- Watch animations on water movement from roots to xylem
- Discuss how endodermis cells create root pressure
- Explain cohesion and adhesion forces in capillarity
- Search for information on forces that move water up the xylem

How do plants absorb water from the soil?
What forces move water from roots up through the plant?

- Spotlight Biology Learner's Book Grade 10 pg. 117
- Animations/video clips
- Charts
- Digital resources
- Spotlight Biology Learner's Book Grade 10 pg. 118
- Charts
- Reference books
- Digital resources

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Plants

Transport - Transpiration pull

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

- Explain transpiration pull as the main force for water movement in plants
- Describe how water evaporation from leaves creates a pulling force
- Connect transpiration to how tall trees like eucalyptus transport water to their topmost leaves

- Discuss how transpiration creates an osmotic gradient in xylem
- Explain the role of cohesion in maintaining continuous water column
- Watch animations showing transpiration pull mechanism

How does transpiration pull water up through tall plants?

- Spotlight Biology Learner's Book Grade 10 pg. 119
- Animations
- Charts
- Digital resources

- Written tests - Oral questions - Observation

Anatomy and Physiology of Plants

Transport - Demonstrating water uptake in plants

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

- Demonstrate water uptake in plants using coloured dyes
- Observe the pathway of water movement through plant tissues
- Visualize how water travels through plants similar to how blood flows through human veins

- Place cut stems of kales or cabbage in beakers with coloured dye
- Observe colour changes in leaves after 40 minutes
- Cut transverse sections to observe dye distribution in vascular tissues

How can we demonstrate the pathway of water uptake in plants?

- Spotlight Biology Learner's Book Grade 10 pg. 119
- Kales or cabbage leaves
- Blue and red dyes
- Beakers
- Scalpels

- Practical assessment - Observation - Oral questions

Anatomy and Physiology of Plants

Transport - Demonstrating transpiration

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

- Define transpiration
- Demonstrate transpiration using potted plants
- Connect transpiration to how plants cool themselves similar to how sweating cools our bodies

- Cover potted plants with transparent polythene bags
- Observe water droplets forming inside the bags after 6 hours
- Discuss the importance of transpiration in cooling plants

What is transpiration and how can it be demonstrated?

- Spotlight Biology Learner's Book Grade 10 pg. 120
- Potted plants
- Transparent polythene bags
- Sunlight

- Practical assessment - Observation - Oral questions

Anatomy and Physiology of Plants

Transport - Environmental factors affecting transpiration (Temperature and light)
Transport - Environmental factors affecting transpiration (Wind and humidity)

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

- Investigate how temperature and light intensity affect transpiration rate
- Use a potometer to measure rate of water uptake
- Relate these factors to why plants wilt faster on hot sunny days

- Investigate how wind and humidity affect transpiration rate
- Explain the effect of air currents and moisture on water loss
- Connect these factors to why laundry dries faster on windy days versus humid days

- Set up potometer with leafy shoots
- Place set-ups near electric heater and in bright sunshine
- Record time taken for air bubble to move along capillary tube
- Set up potometer near a running fan
- Cover shoots with polythene bags to increase humidity
- Compare rates of water uptake under different conditions

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

- Spotlight Biology Learner's Book Grade 10 pg. 121
- Potometer
- Leafy twigs
- Electric heater
- Stopwatch
- Spotlight Biology Learner's Book Grade 10 pg. 122
- Potometer
- Fan
- Polythene bags
- Stopwatch

- Practical assessment - Written assignments - Observation
- Practical assessment - Oral questions - Written tests

Anatomy and Physiology of Plants

Transport - Structural factors affecting transpiration

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

- Explain how leaf structure affects transpiration rate
- Describe adaptations that reduce or increase water loss
- Relate plant structural adaptations to survival in different climates like deserts and wetlands

- Compare transpiration rates in plants with different leaf sizes
- Discuss effects of cuticle thickness, stomata number and sunken stomata
- Investigate transpiration in leaves with different structural features

How do leaf structural features affect the rate of transpiration?

- Spotlight Biology Learner's Book Grade 10 pg. 124
- Leaves of different plants
- Potometer
- Hand lens

- Written assignments - Practical assessment - Observation

Anatomy and Physiology of Plants

Transport - Mechanism of translocation

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

- Define translocation
- Describe how manufactured food is transported in plants
- Relate translocation to how fruits develop and storage organs like potatoes and carrots store food

- Search for information on translocation in plants
- Discuss cytoplasmic streaming, mass flow and active transport
- Watch animations showing movement of food through phloem

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

- Spotlight Biology Learner's Book Grade 10 pg. 126
- Animations
- Charts
- Digital resources

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Plants

Transport - Bark ringing experiment

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

- Demonstrate translocation through bark ringing experiment
- Explain why the region above the ring swells
- Connect this experiment to why girdling by animals or humans can kill trees

- Remove a complete ring of bark from a woody plant stem
- Observe changes above and below the ring over four weeks
- Discuss how accumulation of sugars causes swelling above the ring

What evidence supports translocation through the phloem?

- Spotlight Biology Learner's Book Grade 10 pg. 127
- Woody plant
- Knife/scalpel
- Protective clothing

- Practical assessment - Observation - Oral questions

Anatomy and Physiology of Plants

Transport - Importance of transport in plants
Gaseous Exchange - Meaning of gaseous exchange

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

- Explain the significance of transport in plants
- Describe how transport supports plant growth and development
- Connect plant transport to agricultural practices like proper watering and fertilizer application

- Define gaseous exchange
- Explain the significance of gaseous exchange to plants
- Connect gaseous exchange to how plants provide oxygen for all breathing organisms

- Discuss how water transport maintains turgor pressure
- Explain how transpiration cools plants
- Search for information on significance of transport in plants
- Search for information on meaning of gaseous exchange
- Discuss the concentration gradient that aids gaseous exchange
- Share findings with classmates for peer assessment

Why is transport important for plant survival and growth?
What is gaseous exchange and why is it important to plants?

- Spotlight Biology Learner's Book Grade 10 pg. 128
- Charts
- Reference books
- Digital resources
- Spotlight Biology Learner's Book Grade 10 pg. 132
- Charts
- Reference books
- Digital resources

- Written tests - Oral questions - Group presentations
- Oral questions - Written assignments - Observation

Anatomy and Physiology of Plants

Gaseous Exchange - Stomata as gaseous exchange sites

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

- Identify stomata as gaseous exchange sites in leaves
- Prepare nail varnish peels to observe stomata under microscope
- Relate stomata function to how plants breathe through tiny pores on their leaves

- Apply nail varnish on leaf surfaces and peel when dry
- Mount peels on slides and observe under microscope
- Draw and label stomata, guard cells and epidermal cells

How are stomata structured for gaseous exchange?

- Spotlight Biology Learner's Book Grade 10 pg. 134
- Clear nail varnish
- Leaves
- Microscope
- Slides

- Practical assessment - Observation - Oral questions

Anatomy and Physiology of Plants

Gaseous Exchange - Lenticels and pneumatophores

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

- Describe lenticels and pneumatophores as gaseous exchange sites
- Explain the structure and function of lenticels in woody stems
- Connect pneumatophores to how mangrove trees survive in waterlogged coastal areas

- Study photographs of lenticels on woody stems
- Observe pictures of pneumatophores in mangrove plants
- Discuss how these structures facilitate gaseous exchange

How do lenticels and pneumatophores facilitate gaseous exchange?

- Spotlight Biology Learner's Book Grade 10 pg. 135
- Pictures of lenticels and pneumatophores
- Woody stem specimens
- Charts

- Written assignments - Oral questions - Observation

Anatomy and Physiology of Plants

Gaseous Exchange - Adaptations in aquatic plants

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

- Describe adaptations of gaseous exchange sites in aquatic plants
- Explain how hydrophytes exchange gases in water environments
- Relate these adaptations to how water lilies and lotus plants float and breathe

- Study diagrams of transverse sections of water lily leaves
- Discuss adaptations like stomata on upper surface and aerenchyma tissue
- Observe permanent slides of hydrophyte leaves

How are aquatic plants adapted for gaseous exchange?

- Spotlight Biology Learner's Book Grade 10 pg. 136
- Permanent slides
- Microscope
- Charts
- Digital resources

- Oral questions - Written tests - Observation

Anatomy and Physiology of Plants

Gaseous Exchange - Adaptations in terrestrial plants
Gaseous Exchange - Structure of stomata and guard cells

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

- Describe adaptations of gaseous exchange sites in xerophytes and mesophytes
- Compare gaseous exchange adaptations in plants from different habitats
- Connect plant adaptations to how cacti survive in deserts and grass survives in savannahs

- Describe the structure of stomata and guard cells
- Explain the unique features of guard cells
- Relate guard cell structure to how plants control water loss like adjustable valves

- Discuss adaptations of xerophytes like sunken stomata and thick cuticle
- Compare stomata distribution in mesophytes
- Search for information on how terrestrial plants balance gaseous exchange with water conservation
- Discuss the bean-shaped structure of guard cells
- Explain features of guard cells including chloroplasts and thick inner walls
- Draw diagrams of open and closed stomata

How are terrestrial plants adapted for gaseous exchange in different environments?
What are the structural features of guard cells that enable stomatal opening and closing?

- Spotlight Biology Learner's Book Grade 10 pg. 137
- Charts
- Pictures of xerophytes and mesophytes
- Digital resources
- Spotlight Biology Learner's Book Grade 10 pg. 138
- Charts showing stomata structure
- Microscope
- Prepared slides

- Written assignments - Oral questions - Group presentations
- Oral questions - Written assignments - Observation

Anatomy and Physiology of Plants

Gaseous Exchange - Mechanism of stomatal opening and closing

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

- Explain the mechanism of stomatal opening and closing
- Describe the role of turgor pressure in guard cells
- Connect stomatal movement to how plants prevent wilting by closing stomata during hot afternoons

- Discuss how water intake makes guard cells turgid and opens stomata
- Explain how water loss makes guard cells flaccid and closes stomata
- Watch animations showing stomatal opening and closing

How do changes in turgor pressure cause stomata to open and close?

- Spotlight Biology Learner's Book Grade 10 pg. 139
- Animations
- Charts
- Digital resources

- Written tests - Oral questions - Observation

Anatomy and Physiology of Plants

Gaseous Exchange - Theories explaining stomatal movement

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

- Describe theories explaining stomatal opening and closing
- Compare photosynthetic theory, starch-sugar interconversion theory and potassium ion theory
- Understand how scientific theories help explain complex biological processes

- Watch animations showing different theories of stomatal movement
- Discuss each theory and its explanation of stomatal mechanism
- Write essays comparing the different theories

What theories explain how stomata open and close?

- Spotlight Biology Learner's Book Grade 10 pg. 140
- Animations
- Reference books
- Digital resources

- Written assignments - Oral questions - Observation

Anatomy and Physiology of Plants

Gaseous Exchange and Respiration - Introduction to respiration

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

- Define respiration
- State the types of respiration
- Connect respiration to how plants release energy for growth similar to how food gives us energy

- Search for information on the meaning of respiration
- Discuss the role of enzymes in controlling respiratory reactions
- Compare aerobic and anaerobic respiration

What is respiration and why is it important to plants?

- Spotlight Biology Learner's Book Grade 10 pg. 142
- Charts
- Reference books
- Digital resources

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Plants

Gaseous Exchange and Respiration - Investigating aerobic respiration
Gaseous Exchange and Respiration - Stages of aerobic respiration

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

- Investigate aerobic respiration in living organisms
- Identify products of aerobic respiration
- Connect aerobic respiration to why we feel warm during exercise and plants generate heat

- Describe the stages of aerobic respiration (glycolysis and Krebs cycle)
- Explain where each stage occurs in the cell
- Relate ATP production to how cells obtain energy currency for their activities

- Set up experiment with yeast and glucose solution
- Observe temperature changes and gas production
- Test gas produced with lime water to confirm carbon dioxide
- Search for information on glycolysis and Krebs cycle
- Discuss how glucose is broken down to pyruvic acid in cytoplasm
- Explain reactions in mitochondria that produce most ATP

What are the products of aerobic respiration?
What are the main stages of aerobic respiration?

- Spotlight Biology Learner's Book Grade 10 pg. 143
- Yeast suspension
- Glucose solution
- Lime water
- Boiling tubes
- Spotlight Biology Learner's Book Grade 10 pg. 145
- Charts
- Reference books
- Digital resources

- Practical assessment - Observation - Oral questions
- Written tests - Oral questions - Observation

Anatomy and Physiology of Plants

Gaseous Exchange and Respiration - Investigating anaerobic respiration

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

- Investigate anaerobic respiration in living organisms
- Identify products of anaerobic respiration
- Connect anaerobic respiration to how yeast produces alcohol in traditional brewing

- Set up experiment with yeast, glucose and oil layer
- Observe gas production and temperature changes
- Discuss how ethanol and carbon dioxide are produced in absence of oxygen

What are the products of anaerobic respiration?

- Spotlight Biology Learner's Book Grade 10 pg. 146
- Yeast suspension
- Glucose solution
- Oil
- Lime water

- Practical assessment - Observation - Written assignments

Anatomy and Physiology of Plants

Gaseous Exchange and Respiration - Applications in food and beverage industry

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

- Explain economic importance of anaerobic respiration in food and beverage industry
- Describe the role of fermentation in baking and brewing
- Apply knowledge to understand how bread rises and traditional beverages like busaa are made

- Discuss how yeast fermentation produces ethanol in brewing
- Explain how carbon dioxide makes dough rise in bread making
- Search for information on production of yoghurt and cheese

How is anaerobic respiration applied in the food and beverage industry?

- Spotlight Biology Learner's Book Grade 10 pg. 147
- Pictures of fermentation products
- Reference books
- Digital resources

- Oral questions - Written assignments - Group presentations

Anatomy and Physiology of Plants

Gaseous Exchange and Respiration - Applications in agriculture and biofuel

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

- Explain economic importance of anaerobic respiration in agriculture and biofuel production
- Describe production of silage, biogas and liquid manure
- Relate fermentation to sustainable farming practices and renewable energy production

- Discuss how anaerobic bacteria produce biogas from organic waste
- Explain production of silage for animal feeds
- Plan projects on fermentation using locally available materials

How is anaerobic respiration applied in agriculture and biofuel production?

- Spotlight Biology Learner's Book Grade 10 pg. 148
- Pictures of biogas plants
- Reference books
- Digital resources

- Written tests - Project assessment - Oral questions

Anatomy and Physiology of Plants

Gaseous Exchange and Respiration - Importance to plants and environment

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

- Explain the significance of gaseous exchange and respiration to plants and the environment
- Describe how these processes support life and maintain environmental balance
- Connect plant respiration and gaseous exchange to maintaining the oxygen-carbon dioxide balance essential for all life on Earth

- Discuss how gaseous exchange releases oxygen essential for animal respiration
- Explain how plants help reduce atmospheric carbon dioxide
- Write essays on significance of gaseous exchange and respiration

Why are gaseous exchange and respiration important to plants and the environment?

- Spotlight Biology Learner's Book Grade 10 pg. 148
- Charts
- Reference books
- Digital resources

- Written assignments - Oral questions - Group presentations