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)
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:
- 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
- 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

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)
- 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

Why is gaseous exchange important to plants and the environment?
What is the structure of stomata and how are they adapted for gaseous exchange?

- 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
- 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

- Oral questions - Observation - Written assignments
- 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
Gaseous Exchange and Respiration - Starch-sugar inter-conversion theory

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

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
- 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

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Plants

Gaseous Exchange and Respiration - Economic importance of anaerobic respiration
Gaseous Exchange and Respiration - Biogas production project

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
- 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:
- 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
- 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 is anaerobic respiration applied in everyday industries and products?
How can anaerobic respiration be harnessed for biogas production?

- Distinction Biology Learner's Book Grade 10 pg. 174
- Digital resources
- Charts showing applications of anaerobic respiration
- Distinction Biology Learner's Book Grade 10 pg. 175
- Large plastic bottle/container
- Organic waste, water
- Rubber tubing, balloon, tape

- Oral questions - Written assignments - Observation
- 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

Anatomy and Physiology of Animals

Mouthparts of insects - Structure of mouthparts of insects and their functions
Mouthparts of insects - Biting and chewing mouthparts
Mouthparts of insects - Piercing and sucking mouthparts

By the end of the lesson, the learner should be able to:
- Define the term nutrition in animals
- Identify the mouthparts of a locust, grasshopper or cockroach using a hand lens
- Handle specimens responsibly during collection and observation in the school environment

In groups, learners are guided to:
- Collect fresh specimens of locust/grasshopper/cockroach from the school environment
- Observe the mouthparts using a hand lens or dissecting microscope
- Identify the structures of the mouthparts such as the upper and lower lips, tongue-like structures and jaws
- Draw well-labelled diagrams of the mouthparts observed

What structures make up the mouthparts of a locust or grasshopper?

- Distinction Biology Learner's Book pg. 175
- Fresh locust, grasshopper or cockroach
- Hand lens or dissecting microscope
- Pair of forceps
- Petri dish
- Protective clothing
- Digital resources
- Internet access
- Charts showing mouthparts of insects
- Distinction Biology Learner's Book pg. 177
- Photographs of mosquito and tsetse fly mouthparts

- Observation - Oral questions - Labelled drawings

Anatomy and Physiology of Animals

Mouthparts of insects - Siphoning mouthparts
Mouthparts of insects - Comparing mouthparts and modes of feeding
Beaks of birds - Structure of beaks of birds

By the end of the lesson, the learner should be able to:
- Describe the siphoning mode of feeding in butterflies and moths
- Relate the structure of the proboscis to its function in siphoning nectar
- Relate siphoning in butterflies to real-life processes such as pollination of flowers in farms and gardens

In groups, learners are guided to:
- Study photographs and illustrations of siphoning mouthparts of a butterfly or moth
- Discuss how the proboscis is adapted for siphoning nectar
- Relate the structure of the proboscis to its function in siphoning
- Use digital devices to watch video animations on siphoning mouthparts

How is the proboscis of a butterfly adapted for siphoning nectar from flowers?

- Distinction Biology Learner's Book pg. 178
- Digital resources
- Internet access
- Photographs of butterfly mouthparts
- Distinction Biology Learner's Book pg. 179
- Charts showing mouthparts of various insects
- Internet access
- Distinction Biology Learner's Book pg. 181
- Charts and photographs of bird beaks

- Oral questions - Written assignments - Class presentations

Anatomy and Physiology of Animals

Beaks of birds - Filter feeders, fish eaters and wood chippers
Beaks of birds - Fruit eaters, multipurpose feeders and insect eaters
Beaks of birds - Nature walk to observe birds and their feeding habits
Beaks of birds - Comparing beaks and modes of feeding in birds

By the end of the lesson, the learner should be able to:
- Describe the structure of beaks in filter feeders, fish eaters and wood chippers
- Relate the structure of beaks of flamingos, kingfishers and woodpeckers to their mode of feeding
- Link filter feeding in flamingos to real-life examples like water filtration methods used in homes
- Compare the structure and function of beaks in different birds
- Tabulate the adaptations of beaks of birds to their modes of feeding
- Apply knowledge of beak adaptations to real-life situations such as understanding why certain birds are effective pest controllers in farms

In groups, learners are guided to:
- Study photographs and illustrations of beaks of flamingos, ducks, kingfishers, herons and woodpeckers
- Discuss how the broad flat beak of a duck is adapted for filter feeding
- Relate the long sharp beak of a kingfisher to catching fish
- Describe how the chisel-shaped beak of a woodpecker is adapted for drilling wood
- Draw a comparison table relating the structure of beaks of birds to their modes of feeding
- Discuss and compare the beaks of seed eaters, flesh eaters, nectar feeders, filter feeders, fish eaters, wood chippers, fruit eaters and multipurpose feeders
- Share findings with peers for discussion and peer assessment

How are the beaks of filter feeders and fish eaters adapted for obtaining food from water?
Why do birds have differently shaped and sized beaks?

- Distinction Biology Learner's Book pg. 183
- Digital resources
- Internet access
- Photographs of bird beaks
- Photographs and charts of bird beaks
- Distinction Biology Learner's Book pg. 184
- Binoculars (optional)
- Magnifying glass
- Digital devices
- Protective clothing such as reflective vests and proper shoes
- Distinction Biology Learner's Book pg. 185
- Charts and photographs of bird beaks
- Digital resources
- Internet access

- Written assignments - Oral questions - Observation
- Written assignments - Oral questions - Peer assessment

Anatomy and Physiology of Animals

Importance of diversity in feeding modes of insects and birds
Significance of transport in animals
Types of circulatory systems - Open and closed circulatory systems

By the end of the lesson, the learner should be able to:
- Explain the importance of diversity in feeding modes of insects and birds in nature
- Describe how diversity in feeding modes helps in pollination, seed dispersal and pest control
- Relate feeding diversity to real-life environmental benefits such as how insect-eating birds reduce crop pests in farms and how nectar-feeding insects support fruit production

In groups, learners are guided to:
- Discuss the importance of diversity in feeding modes of insects and birds in nature
- Explain how diversity in feeding modes of insects and birds helps in plant pollination and seed dispersal
- Describe how birds feeding on insects help in controlling pests in the environment
- Analyse a wheel chart on the importance of diversity in feeding modes

How does the diversity in feeding modes of insects and birds benefit the environment?

- Distinction Biology Learner's Book pg. 185
- Digital resources
- Internet access
- Charts on importance of feeding diversity
- Distinction Biology Learner's Book pg. 186
- Reference books
- Distinction Biology Learner's Book pg. 188
- Charts showing circulatory systems

- Oral questions - Written assignments - Class discussions

Anatomy and Physiology of Animals

Types of circulatory systems - Single and double circulatory systems
Transport system in insects
Transport system in fish - Structure and blood flow

By the end of the lesson, the learner should be able to:
- Distinguish between single and double circulatory systems in animals
- Illustrate single and double circulatory systems
- Connect single circulation in fish to real-life observations of how fish survive in aquatic environments

In groups, learners are guided to:
- Study illustrations of single and double circulatory systems
- Discuss how blood flows through the heart once in single circulation and twice in double circulation
- Compare single and double circulatory systems giving examples of animals
- Draw and label diagrams of single and double circulatory systems

How many times does blood pass through the heart in single and double circulatory systems?

- Distinction Biology Learner's Book pg. 189
- Digital resources
- Internet access
- Charts showing single and double circulation
- Distinction Biology Learner's Book pg. 190
- Charts showing insect circulatory system
- Distinction Biology Learner's Book pg. 192
- Charts showing fish circulatory system

- Written assignments - Oral questions - Peer assessment of drawings

Anatomy and Physiology of Animals

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

By the end of the lesson, the learner should be able to:
- Illustrate the structure of the transport system in fish
- Explain why fish have a single closed circulatory system
- Relate the efficiency of the fish circulatory system to real-life observations of how fish remain active in water

In groups, learners are guided to:
- Draw a well-labelled diagram of the circulatory system in fish
- Use digital devices to search for video animations of the transport system in fish
- Exchange exercise books with peers for peer assessment of drawings
- Discuss the advantages of a single closed circulatory system in fish

Why is the circulatory system in fish described as a single closed system?

- Distinction Biology Learner's Book pg. 193
- Digital resources
- Internet access
- Reference books
- Distinction Biology Learner's Book pg. 194
- Charts showing amphibian circulatory system
- Distinction Biology Learner's Book pg. 195

- Peer assessment of drawings - Oral questions - Written assignments

Anatomy and Physiology of Animals

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

How does the partial septum in the reptile heart reduce mixing of blood?
What are the key components of the mammalian transport system?

- Distinction Biology Learner's Book pg. 197
- Digital resources
- Internet access
- Charts showing reptile circulatory system
- Distinction Biology Learner's Book pg. 198
- Reference books
- 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

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

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

Why do mammals have a more efficient circulatory system compared to other animals?

- 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

- Peer assessment of drawings - Written assignments - Oral questions

Anatomy and Physiology of Animals

Pumping mechanism of the mammalian heart - Structure of the heart

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

What is the role of each chamber and valve in the mammalian heart?

- Distinction Biology Learner's Book pg. 202
- Digital resources
- Internet access
- Charts showing the mammalian heart

- Oral questions - Labelled drawings - Written assignments

Anatomy and Physiology of Animals

Pumping mechanism of the mammalian heart - The cardiac cycle
Human lymphatic system - Structure and components
Human lymphatic system - Functions

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
- 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:
- 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
- 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 heart pump blood through the body in a continuous cycle?
How does the lymphatic system protect the body against infections?

- Distinction Biology Learner's Book pg. 203
- Digital resources
- Internet access
- Reference books
- Distinction Biology Learner's Book pg. 204
- Charts showing the lymphatic system
- Distinction Biology Learner's Book pg. 205
- Digital resources
- Internet access
- Reference books

- Oral questions - Written assignments - Class discussions
- 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

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

What is the difference between inherited and acquired immunity?

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

- Oral questions - Written assignments - Observation

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
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 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
- Distinction Biology Learner's Book pg. 209
- Charts showing ABO blood grouping

- Written assignments - Oral questions - Flow 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
Respiratory structures in birds

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
- Distinction Biology Learner's Book pg. 220
- Charts showing bird respiratory system

- Labelled drawings - Oral questions - Observation

Anatomy and Physiology of Animals

Mechanism of gaseous exchange in humans - Respiratory structures
Inhalation and exhalation in humans

By the end of the lesson, the learner should be able to:
- Identify the structures of the respiratory system in human beings
- Describe how gaseous exchange takes place in the alveoli
- Relate the respiratory system to real-life experiences such as how a doctor listens to breathing sounds using a stethoscope to diagnose respiratory problems

In groups, learners are guided to:
- Study illustrations of the respiratory structure in human beings
- Identify the nostrils, trachea, bronchi, bronchioles, alveoli, lungs and diaphragm
- Describe how oxygen diffuses from the alveoli into the blood capillaries and carbon (IV) oxide diffuses out
- Discuss the characteristics of the alveoli that allow efficient gaseous exchange

How does gaseous exchange take place in the alveoli of human lungs?

- Distinction Biology Learner's Book pg. 221
- Digital resources
- Internet access
- Charts showing human respiratory system
- Distinction Biology Learner's Book pg. 222
- Charts showing inhalation and exhalation

- Oral questions - Written assignments - Labelled drawings

Anatomy and Physiology of Animals

Model to demonstrate inhalation and exhalation

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

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

How does the bell jar model help demonstrate the process of breathing in humans?

- Distinction Biology Learner's Book pg. 224
- Bell jar or plastic bottle
- Rubber stopper
- Y-shaped connecting tube
- Balloons
- Rubber sheet
- Protective clothing

- Model construction - Oral questions - Observation

Anatomy and Physiology of Animals

Dissection to observe gaseous exchange structures in mammals
Aerobic respiration in animals
Demonstrating aerobic respiration in animals

By the end of the lesson, the learner should be able to:
- 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
- Carry out an experiment to demonstrate aerobic respiration in animals
- Explain why lime water turns milky in the presence of carbon (IV) oxide produced during respiration
- Connect the experiment to real-life understanding of why we exhale carbon (IV) oxide which can be detected by breathing into lime water

In groups, learners are guided to:
- 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
- Set up the apparatus with a small animal (snail or rat), bell jar, soda lime and lime water
- Observe changes in the lime water in flasks A and B
- Explain that lime water in flask A stays clear because soda lime absorbs carbon (IV) oxide from the atmosphere
- Explain that lime water in flask B turns milky due to carbon (IV) oxide produced by the animal during respiration

What gaseous exchange structures can be observed in a dissected small mammal?
How can we demonstrate that animals produce carbon (IV) oxide during aerobic respiration?

- 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
- 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

- Labelled drawings - Observation - Oral questions
- Observation - Oral questions - Written reports

Anatomy and Physiology of Animals

Anaerobic respiration and oxygen debt
Factors affecting energy requirement in humans

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

- Oral questions - Written assignments - Observation of physical activity

Anatomy and Physiology of Animals

Respiratory substrates

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

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

Which food substances are broken down to provide energy during respiration?

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

- Oral questions - Written assignments - Observation

Anatomy and Physiology of Animals

Calculating the respiratory quotient
Factors affecting the rate of respiration

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

How is the respiratory quotient used to determine the substrate being oxidised during respiration?

- Distinction Biology Learner's Book pg. 233
- Digital resources
- Internet access
- Reference books
- Distinction Biology Learner's Book pg. 234

- Written assignments - Oral questions - Problem-solving exercises

Anatomy and Physiology of Animals

Importance of gaseous exchange and respiration in animals

By the end of the lesson, the learner should be able to:
- Explain the importance of gaseous exchange and respiration in animals
- Describe how gaseous exchange and respiration support various body functions
- Relate the importance of gaseous exchange and respiration to real-life situations such as why adequate ventilation in classrooms and homes is essential for good health

In groups, learners are guided to:
- Discuss how gaseous exchange supplies the body with oxygen used for respiration and removes carbon (IV) oxide
- Explain how respiration provides energy for physical activities, muscle contraction, growth and body temperature regulation
- Discuss how gaseous exchange ensures survival of animals in different habitats
- Share findings with peers

Why are gaseous exchange and respiration essential for the survival of animals?

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

- Oral questions - Written assignments - Class discussions