Anatomy and Physiology of Plants

Gaseous Exchange and Respiration - Meaning and significance of gaseous exchange in plants

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

- Oral questions - Observation - Written assignments

Anatomy and Physiology of Plants

Gaseous Exchange and Respiration - Stomata as a site for gaseous exchange (Practical)
Gaseous Exchange and Respiration - Distribution of stomata in different plant habitats
Gaseous Exchange and Respiration - Lenticels as gaseous exchange sites in stems
Gaseous Exchange and Respiration - Pneumatophores as gaseous exchange sites in roots

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

- Observe stomata in leaves using a microscope
- Describe the structure of stomata and guard cells
- Handle microscope slides and nail polish carefully, disposing of waste materials appropriately after the practical

- Describe the structure and adaptations of lenticels for gaseous exchange
- Explain the mechanism of gaseous exchange through lenticels
- Relate lenticels to the small raised spots visible on the bark of woody plants like hibiscus or guava trees

In groups, learners are guided to:
- Apply clear nail polish on the lower surface of a leaf, peel off after drying and observe under a microscope
- Identify stomata and guard cells under the microscope
- Discuss the structure of guard cells (thin elastic outer walls, thick inner walls) and how they control the opening and closing of stomata
- Study photomicrographs of lenticels and discuss their structure (loosely packed cork cells, thin film of moisture)
- Discuss how lenticels carry out gaseous exchange continuously
- Explain the mechanism of gaseous exchange through lenticels (diffusion of oxygen in and carbon (IV) oxide out)

What is the structure of stomata and how are they adapted for gaseous exchange?
How do lenticels facilitate gaseous exchange in woody stems?

- Distinction Biology Learner's Book Grade 10 pg. 155
- Fresh plant leaves
- Clear nail polish
- Light microscope, glass slides, cover slips
- 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
- Distinction Biology Learner's Book Grade 10 pg. 163
- Photomicrographs/pictures of pneumatophores

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

Anatomy and Physiology of Plants

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

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

- Describe the mechanism of opening and closing of stomata using the photosynthetic theory
- Explain how glucose production during photosynthesis makes guard cells turgid
- Relate why most plants have open stomata during the day and closed stomata at night to everyday observations of morning dew on grass

In groups, learners are guided to:
- Search for information on the photosynthetic theory explaining the mechanism of opening and closing of stomata
- Discuss how during the day, photosynthesis produces glucose increasing osmotic pressure causing guard cells to become turgid and stomata to open
- Discuss how at night, glucose is converted to starch reducing osmotic pressure causing stomata to close

How does photosynthesis influence the opening of stomata during the day?

- Distinction Biology Learner's Book Grade 10 pg. 165
- Digital resources
- Charts showing open and closed stomata
- Distinction Biology Learner's Book Grade 10 pg. 167
- Internet access

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Plants

Gaseous Exchange and Respiration - Potassium ion theory of stomatal opening and closing
Gaseous Exchange and Respiration - The process of respiration and aerobic respiration

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

- Describe the mechanism of opening and closing of stomata using the potassium ion theory
- Compare the three theories of stomatal opening and closing
- Explain how understanding stomatal mechanisms helps farmers manage irrigation and crop water needs more effectively

In groups, learners are guided to:
- Discuss the potassium ion theory explaining the mechanism of opening and closing of stomata
- Watch animations showing the mechanism of opening and closing of stomata and discuss with peers
- Compare the photosynthetic theory, starch-sugar inter-conversion theory and potassium ion theory

How do potassium ions influence the opening and closing of stomata?

- Distinction Biology Learner's Book Grade 10 pg. 168
- Digital resources
- Internet access
- Charts comparing the three theories
- Distinction Biology Learner's Book Grade 10 pg. 169
- Internet access

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Plants

Gaseous Exchange and Respiration - Anaerobic respiration in plants

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

- Define anaerobic respiration and state its word equation
- Distinguish between aerobic and anaerobic respiration
- Relate anaerobic respiration to the production of alcohol in local brewing and the rising of bread dough during baking

In groups, learners are guided to:
- Discuss anaerobic respiration as the breakdown of glucose in the absence of oxygen producing ethanol, carbon (IV) oxide and less energy
- Compare aerobic and anaerobic respiration in terms of oxygen requirement, energy released and products
- Discuss where anaerobic respiration occurs in plants (waterlogged areas, germinating seeds)

How does anaerobic respiration differ from aerobic respiration?

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

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Plants

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

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

- 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:
- 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
- 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 can aerobic and anaerobic respiration be demonstrated experimentally?
How is anaerobic respiration applied in everyday industries and products?

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

- Practical assessment - Observation - Written assignments
- 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

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

- Portfolio assessment - Oral questions - Observation

Anatomy and Physiology of Plants
Anatomy and Physiology of Animals

Gaseous Exchange and Respiration - Assessment and review on gaseous exchange and respiration
Significance of transport in animals

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

- Answer assessment questions on gaseous exchange sites, stomatal mechanisms, types of respiration and economic importance of anaerobic respiration
- Distinguish between gaseous exchange and respiration in plants
- Connect the concepts learned to real-life applications such as food preservation, energy production and environmental conservation

In groups, learners are guided to:
- Answer assessment exercise questions on gaseous exchange and respiration
- Distinguish between gaseous exchange and respiration
- Identify and explain adaptations of gaseous exchange structures (stomata, lenticels, pneumatophores, aerenchyma)
- Describe mechanisms of opening and closing of stomata using the three theories

How are gaseous exchange and respiration essential to the survival of plants?

- Distinction Biology Learner's Book Grade 10 pg. 178
- Digital resources
- Past assessment questions
- Distinction Biology Learner's Book pg. 186
- Internet access
- Reference books

- Written tests - Oral questions - Observation

Anatomy and Physiology of Animals

Types of circulatory systems - Open and closed circulatory systems
Types of circulatory systems - Single and double circulatory systems

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

- Distinguish between open and closed circulatory systems in animals
- Illustrate open and closed circulatory systems
- Relate open circulatory systems to familiar organisms such as grasshoppers and cockroaches found in the local environment

In groups, learners are guided to:
- Search for information on open and closed circulatory systems using reference materials and the Internet
- Study illustrations of open and closed circulatory systems
- Discuss how the transport fluid flows in open and closed circulatory systems
- Draw and label diagrams of open and closed circulatory systems

How does the flow of transport fluid differ in open and closed circulatory systems?

- Distinction Biology Learner's Book pg. 188
- Digital resources
- Internet access
- Charts showing circulatory systems
- Distinction Biology Learner's Book pg. 189
- Charts showing single and double circulation

- Oral questions - Labelled drawings - Written assignments

Anatomy and Physiology of Animals

Transport system in insects
Transport system in fish - Structure and blood flow
Transport system in fish - Illustrating the circulatory system

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

- Identify the components of the transport system in insects
- Describe the movement of haemolymph within the body cavity of an insect
- Relate the open circulatory system in insects to real-life observations of how small-bodied insects like houseflies and cockroaches function efficiently

In groups, learners are guided to:
- Search for information on the transport system in insects
- Study the structure of the transport system in insects including the dorsal vessel, ostia, haemolymph and haemocoel
- Describe the circulation of haemolymph in the body cavity
- Draw a well-labelled diagram of the transport system in insects

What are the components of the circulatory system in insects and how does haemolymph flow?

- Distinction Biology Learner's Book pg. 190
- Digital resources
- Internet access
- Charts showing insect circulatory system
- Distinction Biology Learner's Book pg. 192
- Charts showing fish circulatory system
- Distinction Biology Learner's Book pg. 193
- Reference books

- Labelled drawings - Oral questions - Peer assessment

Anatomy and Physiology of Animals

Transport system in amphibians - Structure and blood flow
Transport system in amphibians - Illustrating the circulatory system
Transport system in reptiles - Structure and blood flow

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

- Identify the structures that compose the transport system in amphibians
- Describe pulmonary and systemic circulation in amphibians
- Connect the three-chambered heart in amphibians to real-life understanding of how frogs survive both in water and on land

- Identify the structures that compose the transport system in reptiles
- Describe pulmonary and systemic circulation in reptiles
- Connect the partial septum in the reptile heart to real-life understanding of why reptiles like chameleons and lizards bask in the sun to regulate body temperature

In groups, learners are guided to:
- Search for information on the transport system in amphibians using print and non-print resources
- Study illustrations of the transport system in amphibians
- Identify the three-chambered heart (one ventricle and two atria), blood vessels, lungs and blood
- Describe pulmonary and systemic circulation in amphibians
- Search for information on the transport system in reptiles using print and non-print resources
- Study illustrations of the circulatory system in reptiles
- Identify the three-chambered heart with a partial septum and the four-chambered heart of the crocodile
- Describe pulmonary and systemic circulation in reptiles

How does the double circulatory system in amphibians support their life on land and in water?
How does the partial septum in the reptile heart reduce mixing of blood?

- Distinction Biology Learner's Book pg. 194
- Digital resources
- Internet access
- Charts showing amphibian circulatory system
- Distinction Biology Learner's Book pg. 195
- Reference books
- Distinction Biology Learner's Book pg. 197
- Digital resources
- Internet access
- Charts showing reptile circulatory system

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Animals

Transport system in reptiles - Illustrating the circulatory system

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

- Illustrate the structure of the transport system in reptiles
- Explain the significance of the partial septum in the reptile heart
- Relate the ectothermic nature of reptiles to real-life observations of lizards sunbathing on rocks and walls

In groups, learners are guided to:
- Draw a well-labelled diagram of the circulatory system in reptiles
- Discuss the role of the partial septum in reducing mixing of oxygenated and deoxygenated blood
- Compare the circulatory systems of amphibians and reptiles
- Share drawings with peers for peer assessment

Why is the transport system in reptiles suited to their ectothermic nature?

- Distinction Biology Learner's Book pg. 198
- Digital resources
- Internet access
- Reference books

- Peer assessment of drawings - Oral questions - Written assignments

Anatomy and Physiology of Animals

Transport system in mammals - Structure and components

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

- Identify the structures that compose the transport system in mammals
- Describe the components of the mammalian circulatory system
- Relate the four-chambered mammalian heart to real-life understanding of why mammals like humans can perform sustained physical activities

In groups, learners are guided to:
- Search for information on the transport system in mammals using print and non-print resources
- Study illustrations and photographs of the circulatory system in mammals
- Identify the four-chambered heart, blood vessels, blood and circulatory pathways
- Discuss the components of the mammalian circulatory system

What are the key components of the mammalian transport system?

- Distinction Biology Learner's Book pg. 199
- Digital resources
- Internet access
- Charts showing mammalian circulatory system

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Animals

Transport system in mammals - Pulmonary and systemic circulation

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

- Describe pulmonary and systemic circulation in mammals
- Trace the pathway of blood flow in the mammalian circulatory system
- Connect double circulation in mammals to real-life experiences like increased heartbeat rate during running or exercise

In groups, learners are guided to:
- Use digital devices to search for video animations illustrating the transport system in mammals
- Trace the pathway of blood flow in the mammalian circulatory system
- Describe pulmonary circulation (heart to lungs and back) and systemic circulation (heart to body and back)
- Discuss with peers

How does blood flow through the mammalian heart in pulmonary and systemic circulation?

- Distinction Biology Learner's Book pg. 200
- Digital resources
- Internet access
- Reference books

- Oral questions - Written assignments - Class discussions

Anatomy and Physiology of Animals

Transport system in mammals - Illustrating the circulatory system
Transport system in mammals - Dissection of a small mammal
Pumping mechanism of the mammalian heart - Structure of the heart

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

- Illustrate the structure of the transport system in mammals
- Draw a well-labelled diagram of the mammalian circulatory system
- Relate the efficient separation of oxygenated and deoxygenated blood to real-life benefits like high energy levels in active mammals such as cheetahs and horses

- Describe the structure of the mammalian heart including its four chambers
- Identify the blood vessels that carry blood to and from the heart
- Relate the structure of the heart to real-life understanding of heartbeat sounds heard through a stethoscope during medical check-ups

In groups, learners are guided to:
- Draw a well-labelled diagram of the circulatory system in mammals
- Use digital devices to search for pictures showing the transport system in mammals
- Exchange exercise books with peers for peer assessment
- Compare the circulatory systems of insects, fish, amphibians, reptiles and mammals
- Study illustrations of the mammalian heart
- Identify the four chambers (right atrium, left atrium, right ventricle and left ventricle)
- Identify blood vessels connected to the heart (vena cava, aorta, pulmonary artery and pulmonary vein)
- Discuss the roles of the ventricles, atria and valves in pumping blood

Why do mammals have a more efficient circulatory system compared to other animals?
What is the role of each chamber and valve in the mammalian heart?

- Distinction Biology Learner's Book pg. 200
- Digital resources
- Internet access
- Reference books
- Distinction Biology Learner's Book pg. 201
- Freshly killed rat or rabbit
- Dissecting board and pins
- Cotton wool
- Hand lens
- Protective clothing
- Distinction Biology Learner's Book pg. 202
- Digital resources
- Internet access
- Charts showing the mammalian heart

- Peer assessment of drawings - Written assignments - Oral questions
- Oral questions - Labelled drawings - Written assignments

Anatomy and Physiology of Animals

Pumping mechanism of the mammalian heart - The cardiac cycle

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

- Describe the pumping mechanism of the mammalian heart
- Explain systole and diastole in the cardiac cycle
- Connect the cardiac cycle to real-life experiences such as feeling the pulse at the wrist or neck during exercise

In groups, learners are guided to:
- Watch animations illustrating the pumping mechanism of the mammalian heart
- Describe the flow of blood from the vena cava through the heart chambers and out through the aorta
- Explain the role of valves in preventing backflow of blood
- Discuss the contraction (systole) and relaxation (diastole) phases of the cardiac cycle

How does the heart pump blood through the body in a continuous cycle?

- Distinction Biology Learner's Book pg. 203
- Digital resources
- Internet access
- Reference books

- Oral questions - Written assignments - Class discussions

Anatomy and Physiology of Animals

Human lymphatic system - Structure and components

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

- Describe the human lymphatic system
- Identify the components of the lymphatic system
- Relate the lymphatic system to real-life situations such as swelling of lymph nodes during infections like sore throat or tonsillitis

In groups, learners are guided to:
- Watch video animations on the human lymphatic system using digital devices
- Identify the components of the lymphatic system (lymph fluid, lymphatic vessels, lymph nodes and lymphoid organs)
- Discuss the structure and arrangement of the lymphatic system
- Share findings with peers for discussion

What are the components of the human lymphatic system and how are they arranged?

- Distinction Biology Learner's Book pg. 204
- Digital resources
- Internet access
- Charts showing the lymphatic system

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Animals

Human lymphatic system - Functions

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

- Explain the functions of the human lymphatic system
- Describe how the lymphatic system helps maintain fluid balance and defend against infections
- Relate lymphatic functions to real-life examples such as how swollen ankles (oedema) occur when the lymphatic system fails to drain excess fluid

In groups, learners are guided to:
- Discuss the functions of the human lymphatic system including maintaining fluid balance, filtering pathogens and absorbing fats
- Explain how lymph nodes house immune cells that detect and fight infections
- Describe how the lymphatic system returns excess tissue fluid to the bloodstream
- Share work with classmates for comparison

How does the lymphatic system protect the body against infections?

- Distinction Biology Learner's Book pg. 205
- Digital resources
- Internet access
- Reference books

- Written assignments - Oral questions - Class discussions

Anatomy and Physiology of Animals

Human immune system - Types of immunity
Human immune system - Active and passive immunity

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

- Describe the immune system in human beings
- Distinguish between inherited and acquired immunity
- Relate immunity to real-life experiences such as why a person who recovers from chickenpox rarely gets it again

- Distinguish between active and passive immunity
- Give examples of naturally and artificially acquired immunity
- Connect vaccination programmes in Kenya (such as polio and measles vaccines) to the concept of artificially acquired active immunity

In groups, learners are guided to:
- Study a flow chart illustrating forms of immunity
- Distinguish between inherited (innate) and acquired immunity
- Discuss how inherited immunity is passed from parent to offspring
- Explain how acquired immunity develops through interaction with the environment
- Distinguish between active and passive immunity
- Discuss active immunity where the body produces its own antibodies when triggered by antigens
- Discuss passive immunity where the body receives antibodies from an external source
- Give examples such as breastfeeding (passive) and recovery from disease (active)
- Relate naturally and artificially acquired immunity to real-life vaccination programmes

What is the difference between inherited and acquired immunity?
How do vaccines help the body develop immunity against diseases?

- Distinction Biology Learner's Book pg. 206
- Digital resources
- Internet access
- Charts showing types of immunity
- Distinction Biology Learner's Book pg. 207
- Digital resources
- Internet access
- Reference books

- Oral questions - Written assignments - Observation
- Written assignments - Oral questions - Class discussions

Anatomy and Physiology of Animals

Blood clotting mechanism in humans

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

- Describe the mechanism of blood clotting in human beings
- Identify the role of platelets, thromboplastin, thrombin and fibrin in blood clotting
- Connect blood clotting to real-life experiences such as how a cut on the skin stops bleeding and forms a scab

In groups, learners are guided to:
- Watch video animations on the mechanism of blood clotting using digital devices
- Identify the blood cells (platelets) involved in blood clotting
- Describe the steps in the blood clotting process: platelets release thromboplastin, prothrombin converts to thrombin, fibrinogen converts to fibrin
- Discuss the role of calcium ions and vitamin K in blood clotting

What happens in the body when a blood vessel is injured to stop bleeding?

- Distinction Biology Learner's Book pg. 207
- Digital resources
- Internet access
- Charts showing the blood clotting process

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Animals

Blood clotting mechanism - Importance and flow chart

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

- Explain the importance of blood clotting in mammals
- Illustrate the blood clotting process using a flow chart
- Relate blood clotting to real-life medical situations such as why doctors check clotting time before surgery and why haemophilia patients need special care

In groups, learners are guided to:
- Study a flow chart summarising the blood clotting process
- Describe the mechanism of blood clotting step by step
- Discuss the importance of blood clotting in preventing blood loss, entry of pathogens and healing of wounds
- Share responses with peers for comparison and assessment

Why is blood clotting important for the survival of mammals?

- Distinction Biology Learner's Book pg. 208
- Digital resources
- Internet access
- Reference books

- Written assignments - Oral questions - Flow chart construction

Anatomy and Physiology of Animals

ABO and rhesus factor blood grouping systems - Blood groups and antigens

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

- Explain the ABO blood grouping system in human beings
- Identify the antigens and antibodies in each blood group
- Relate blood grouping to real-life situations such as why hospitals test blood groups before transfusion

In groups, learners are guided to:
- Search for information on the ABO blood grouping system
- Discuss how antigens A and B determine blood groups (A, B, AB and O)
- Identify the antibodies present in each blood group
- Prepare charts illustrating blood groups, antigens and antibodies
- Visit a health facility where possible and discuss blood grouping with a resource person

What determines a person's blood group?

- Distinction Biology Learner's Book pg. 209
- Digital resources
- Internet access
- Charts showing ABO blood grouping

- Oral questions - Written assignments - Chart construction

Anatomy and Physiology of Animals

ABO and rhesus factor blood grouping systems - Rhesus factor and blood transfusion
Respiratory surfaces in animals - General characteristics
Respiratory structures in insects - Tracheal system
Respiratory structures in insects - Adaptations and observation
Respiratory structures in fish - Structure of gills

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

- Explain the rhesus factor blood grouping system
- Describe blood donor-recipient compatibility
- Connect blood transfusion compatibility to real-life medical emergencies where matching blood types saves lives

- Describe the structure of the tracheal system in insects
- Identify spiracles, trachea and tracheoles in the tracheal system
- Relate the tracheal system to real-life observations of how spiracles on a grasshopper's body allow it to breathe

In groups, learners are guided to:
- Discuss the rhesus factor (Rh+ and Rh-) and its role in blood transfusion and pregnancy
- Explain the concepts of universal donor (O) and universal recipient (AB)
- Prepare charts illustrating blood donor-recipient compatibility
- Discuss the importance of knowing one's blood type and rhesus status for medical safety
- Study illustrations of the tracheal system in insects
- Identify the spiracles, trachea, tracheoles and air sacs
- Describe how valves on the spiracles regulate air flow into the insect's body
- Discuss how the tracheal system delivers oxygen directly to cells

Why is it important to determine blood compatibility before transfusion?
How does the tracheal system in insects deliver oxygen directly to body cells?

- Distinction Biology Learner's Book pg. 210
- Digital resources
- Internet access
- Charts showing blood donor-recipient compatibility
- Distinction Biology Learner's Book pg. 211
- Reference books
- Distinction Biology Learner's Book pg. 213
- Digital resources
- Internet access
- Charts showing tracheal system
- Distinction Biology Learner's Book pg. 214
- Live or dead locust or grasshopper
- Hand lens
- Boiling tube
- Protective clothing
- Distinction Biology Learner's Book pg. 216
- Charts showing fish gills

- Written assignments - Oral questions - Chart construction
- Oral questions - Labelled drawings - Written assignments

Anatomy and Physiology of Animals

Respiratory structures in fish - Counter current flow and practical observation
Respiratory structures in amphibians

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

- Explain the counter current exchange system in fish gills
- Observe the structure of gills of a bony fish through dissection
- Relate counter current flow to real-life engineering concepts such as how heat exchangers in factories work on a similar principle

In groups, learners are guided to:
- Discuss the counter current exchange system where blood and water flow in opposite directions across gill filaments
- Explain how this system maintains a concentration gradient for maximum oxygen absorption
- Where possible, dissect a fresh bony fish to observe the gills using a hand lens
- Draw a well-labelled diagram of the gills of a bony fish

How does the counter current flow system in fish gills ensure efficient gaseous exchange?

- Distinction Biology Learner's Book pg. 217
- Fresh or preserved bony fish
- Scalpel
- Hand lens
- Protective clothing
- Distinction Biology Learner's Book pg. 218
- Digital resources
- Internet access
- Charts showing amphibian respiratory structures

- Labelled drawings - Oral questions - Observation

Anatomy and Physiology of Animals

Respiratory structures in birds
Mechanism of gaseous exchange in humans - Respiratory structures

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

- Describe the respiratory structure in birds
- Explain how air sacs and para-bronchi are adapted for efficient gaseous exchange
- Relate the efficient respiratory system of birds to real-life observations of how birds sustain long-distance flights without fatigue

In groups, learners are guided to:
- Study illustrations of the respiratory structure in birds
- Describe the role of air sacs in keeping air flowing in one direction through the lungs
- Explain the function of para-bronchi in allowing continuous airflow during inhalation and exhalation
- Discuss the counter current system in bird lungs for maximum gaseous exchange

How do air sacs in birds ensure a continuous supply of fresh air to the lungs?

- Distinction Biology Learner's Book pg. 220
- Digital resources
- Internet access
- Charts showing bird respiratory system
- Distinction Biology Learner's Book pg. 221
- Charts showing human respiratory system

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Animals

Inhalation and exhalation in humans

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

- Describe the process of inhalation and exhalation in human beings
- Explain the role of the diaphragm, rib cage and intercostal muscles in breathing
- Connect breathing mechanics to real-life situations like how deep breathing exercises help calm the body during stress

In groups, learners are guided to:
- Study illustrations showing what happens during inhalation and exhalation
- Describe how the diaphragm contracts and flattens during inhalation increasing the volume of the thoracic cavity
- Explain how the diaphragm relaxes during exhalation reducing the lung volume
- Discuss the role of external and internal intercostal muscles in moving the rib cage

What changes occur in the chest cavity during inhalation and exhalation?

- Distinction Biology Learner's Book pg. 222
- Digital resources
- Internet access
- Charts showing inhalation and exhalation

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Animals

Model to demonstrate inhalation and exhalation
Dissection to observe gaseous exchange structures in mammals

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

- Construct a model to demonstrate inhalation and exhalation in human beings
- Relate the parts of the model to the structures of the human respiratory system
- Connect model-making to real-life applications of models in medical training and science education

- Dissect a small mammal to observe the gaseous exchange structures
- Identify the trachea, bronchi, lungs and alveoli in the dissected mammal
- Relate the observed structures to real-life understanding of how lung diseases like asthma affect the airways

In groups, learners are guided to:
- Set up the bell jar apparatus with rubber sheet, Y-shaped connecting tube and balloons
- Pull down the rubber sheet to demonstrate inhalation and observe the balloons inflate
- Release the rubber sheet to demonstrate exhalation and observe the balloons deflate
- Relate the rubber sheet to the diaphragm, balloons to the lungs and bell jar to the chest cavity
- Wear protective clothing
- With the help of the teacher, dissect a freshly killed rat or rabbit to observe the gaseous exchange structures
- Identify the trachea, lungs and observe the internal structures
- Connect a drinking straw to the trachea and blow air to observe the lungs inflate
- Draw a well-labelled diagram of the gaseous exchange structures

How does the bell jar model help demonstrate the process of breathing in humans?
What gaseous exchange structures can be observed in a dissected small mammal?

- Distinction Biology Learner's Book pg. 224
- Bell jar or plastic bottle
- Rubber stopper
- Y-shaped connecting tube
- Balloons
- Rubber sheet
- Protective clothing
- Distinction Biology Learner's Book pg. 225
- Freshly killed rat or rabbit
- Dissecting board and pins
- Scalpel or pair of scissors
- Hand lens
- Drinking straw
- Protective clothing

- Model construction - Oral questions - Observation
- Labelled drawings - Observation - Oral questions

Anatomy and Physiology of Animals

Aerobic respiration in animals
Demonstrating aerobic respiration in animals

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

- Describe the process of aerobic respiration in animals
- Write the word equation for aerobic respiration
- Relate aerobic respiration to real-life activities such as how the body uses oxygen to break down food during walking, running or studying

In groups, learners are guided to:
- Discuss the process of aerobic respiration where glucose is broken down in the presence of oxygen to produce energy, carbon (IV) oxide and water
- Write the word equation for aerobic respiration
- Describe the two stages of aerobic respiration: glycolysis and Kreb's cycle
- Discuss the uses of energy produced during respiration

How does the body use oxygen to break down food and release energy?

- Distinction Biology Learner's Book pg. 227
- Digital resources
- Internet access
- Reference books
- Distinction Biology Learner's Book pg. 228
- Small animal (snail or rat)
- Bell jar
- Conical flask
- Delivery tubes
- Soda lime
- Lime water
- Protective clothing

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Animals

Anaerobic respiration and oxygen debt

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

- Describe the process of anaerobic respiration in animals
- Explain the concept of oxygen debt
- Relate anaerobic respiration to real-life experiences such as muscle cramps and fatigue felt after sprinting or intense exercise

In groups, learners are guided to:
- Discuss anaerobic respiration where glucose is broken down in the absence of oxygen to produce lactic acid and energy
- Engage in vigorous physical activity for 3 minutes and observe increased breathing rate
- Explain the concept of oxygen debt as the extra amount of oxygen needed to eliminate lactic acid
- Discuss why breathing rate remains faster after stopping intense physical exercise

Why do muscles feel fatigued and sore after vigorous physical exercise?

- Distinction Biology Learner's Book pg. 229
- Stopwatch
- Playfield
- Writing materials

- Oral questions - Written assignments - Observation of physical activity

Anatomy and Physiology of Animals

Factors affecting energy requirement in humans

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

- Identify factors affecting energy requirement in human beings
- Explain how age, sex, body size and physical activity affect energy needs
- Relate energy requirements to real-life examples such as why athletes eat more food than office workers and why growing teenagers need more energy than elderly people

In groups, learners are guided to:
- Search for information on factors affecting energy requirement in human beings
- Compare the energy needs of teenagers and the elderly, males and females, athletes and secretaries
- Discuss how pregnant and lactating mothers require more energy
- Share ideas in class for discussion

Why do different people require different amounts of energy?

- Distinction Biology Learner's Book pg. 231
- Digital resources
- Internet access
- Reference books

- Oral questions - Written assignments - Class discussions

Anatomy and Physiology of Animals

Respiratory substrates
Calculating the respiratory quotient

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

- Identify the respiratory substrates broken down during respiration
- Explain why glucose is the main respiratory substrate
- Relate respiratory substrates to real-life dietary choices such as why carbohydrate-rich foods like ugali and rice are staple energy sources in many Kenyan households

- Define respiratory quotient (RQ)
- Calculate the respiratory quotient for various foods
- Relate RQ values to real-life applications such as how doctors use RQ to assess a patient's metabolic state and determine which substrates their body is burning

In groups, learners are guided to:
- Discuss respiratory substrates including carbohydrates, fats and proteins
- Explain that glucose is the main respiratory substrate because it is readily broken down
- Discuss why fats provide more energy than carbohydrates but take longer to break down
- Explain that proteins are used for respiration only when carbohydrates and fats are unavailable
- Discuss the formula for calculating respiratory quotient: RQ = CO₂ produced / O₂ consumed
- Calculate the RQ for carbohydrates (RQ = 1.0), proteins (RQ = 0.9) and lipids (RQ = 0.7)
- Solve practical problems on calculating RQ
- Discuss what an RQ value of more than 1 indicates (anaerobic respiration)

Which food substances are broken down to provide energy during respiration?
How is the respiratory quotient used to determine the substrate being oxidised during respiration?

- Distinction Biology Learner's Book pg. 232
- Digital resources
- Internet access
- Reference books
- Distinction Biology Learner's Book pg. 233
- Digital resources
- Internet access
- Reference books

- Oral questions - Written assignments - Observation
- Written assignments - Oral questions - Problem-solving exercises

Anatomy and Physiology of Animals

Factors affecting the rate of respiration
Importance of gaseous exchange and respiration in animals

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

- Identify factors that affect the rate of respiration in animals
- Explain how temperature, oxygen availability, substrate amount and age affect the rate of respiration
- Connect these factors to real-life examples such as why food stored in cold refrigerators lasts longer because low temperature slows down microbial respiration

In groups, learners are guided to:
- Brainstorm and identify factors that affect the rate of respiration
- Discuss how an increase in temperature increases the rate of enzyme activity and respiration
- Explain how the amount of oxygen and substrate available affect the rate of respiration
- Discuss how age and hormones such as adrenaline affect the rate of respiration

How do changes in temperature and oxygen levels affect the rate of respiration?

- Distinction Biology Learner's Book pg. 234
- Digital resources
- Internet access
- Reference books
- Distinction Biology Learner's Book pg. 235

- Oral questions - Written assignments - Class discussions