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Biology
Form 2 2025
TERM III
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WK LSN TOPIC SUB-TOPIC OBJECTIVES T/L ACTIVITIES T/L AIDS REFERENCE REMARKS
1

OPENING AND REVISING OF END TERM EXAMINATION.
2 1
GASEOUS EXCHANGE
Respiratory surfaces in animals.
Gaseous exchange in protozoa.
By the end of the lesson, the learner should be able to:
To define a respiratory surface.
To state characteristics of respiratory surfaces.
To identify the environment or medium of operation of respiratory surfaces.
Teacher exposes meaning of a respiratory surface.
Discuss at length, giving examples of organisms that have a given respiratory surface.
text book
K.L.B. BOOK 2
P. 53
2 2-3
GASEOUS EXCHANGE
Gaseous exchange in insects.
By the end of the lesson, the learner should be able to:
To describe the mechanism of gaseous exchange in insects
Drawing tracheal system of a grasshopper.
Discuss at length the structure of the tracheal system.
Detailed discussion.
text book
K.L.B. BOOK 2
PP. 53, 54
2 4
GASEOUS EXCHANGE
Breathing in insects.
By the end of the lesson, the learner should be able to:
To describe the breathing mechanism in an insect.
Observe breathing movements of live specimens of grasshoppers, locusts or cockroaches.
Live specimens of insects,
Hand lenses,
Boiling tubes.
K.L.B. BOOK 2
P. 56
3 1
GASEOUS EXCHANGE
Number, position and shape of spiracles of insects.
By the end of the lesson, the learner should be able to:
To give an account of the number, position and shape of spiracles of insects.
Drawing the abdomen and showing the position and shape of spiracles, and giving reasons thereof.
Live specimens of insects.
K.L.B. BOOK 2
P. 56
3 2-3
GASEOUS EXCHANGE
Gaseous exchange in a bony fish.
Gaseous exchange in amphibians.
Gaseous exchange in mammals.
By the end of the lesson, the learner should be able to:
To describe the structure of gills of a bony fish.
To explain how a gill is adapted to function as a respiratory surface.
To explain the mechanism of gaseous exchange in gills.

To list down parts of the tracheal system in man.
To describe the function of the parts of a system respiratory.
Drawing and labeling a gill of a fish; stating the function of each part; and stating how it is adapted to its functions.
Detailed discussion.
Discuss at length man?s respiratory system.
A gill of a fish.
text book
Wall chart- Respiratory system in man.
K.L.B. BOOK 2
PP. 56-57
K.L.B. BOOK 2
P. 59
3 4
GASEOUS EXCHANGE
The structure of the lungs.
By the end of the lesson, the learner should be able to:
To explain adaptations of the lungs to their functions.
Drawing labeled diagrams coupled with explanations.
Wall charts- Structure of lungs.
K.L.B. BOOK 2
P. 60-1
4 1
GASEOUS EXCHANGE
Inhalation.
By the end of the lesson, the learner should be able to:
To describe the process of inhalation in man.
Showing movements of ribs during inhalation.
Explain the inhalation mechanism.
Chart / model of a rib cage.
K.L.B. BOOK 2
PP. 61-62
4 2-3
GASEOUS EXCHANGE
Exhalation.
Thoracic cavity model.
By the end of the lesson, the learner should be able to:
To describe the process of exhalation in man.
To identify similarities between a model thoracic cavity and an actual thoracic cavity.
Showing movements of ribs during exhalation.
Explain the exhalation mechanism.

Teacher presents a model thoracic cavity.
Q/A: Comparing parts of the model cavity and the actual rib cage.
Chart / model of a rib cage.
Thoracic cavity model.
K.L.B. BOOK 2
PP. 61-62
K.L.B. BOOK 2
PP. 61-63
4 4
GASEOUS EXCHANGE
Gaseous exchange in an alveolus.
By the end of the lesson, the learner should be able to:
To describe gaseous exchange in an alveolus.
To explain regulation of breathing in man.
Discussion and explanations.
text book
K.L.B. BOOK 2
P. 64
5 1
GASEOUS EXCHANGE
Rate of breathing in man.
By the end of the lesson, the learner should be able to:
To state and explain briefly factors affecting the rate of inhalation / exhalation processes.
Discussion and explanations.
text book
K.L.B. BOOK 2
P. 63
5 2-3
GASEOUS EXCHANGE
Intercostal muscles.
Inhaled and exhaled air.
By the end of the lesson, the learner should be able to:
To explain the function of intercostal muscles during the breathing system.

To test for CO2 in the air we inhale/ exhale.
Detailed discussion.
Counting number of inhalations before and after an exercise blow.

Observe colour changes of lime water, and make deductions.
Brief discussion.

Lime water, rib cage model.
Lime water.
K.L.B. BOOK 2
P. 66
K.L.B. BOOK 2
P. 67
5 4
GASEOUS EXCHANGE
Inhaled and exhaled air.
By the end of the lesson, the learner should be able to:
To test for CO2 in the air we inhale/ exhale.
Observe colour changes of lime water, and make deductions.
Brief discussion.
Lime water.
K.L.B. BOOK 2
P. 67
6 1
GASEOUS EXCHANGE
RESPIRATION
Diseases of the respiratory system.
Introduction ? Definition and importance of respiration.
By the end of the lesson, the learner should be able to:
To state the causes, symptoms and prevention of respiratory diseases.
Discuss cause, symptoms and prevention of whooping cough TB, bronchitis, etc.
Resource person.
text book
K.L.B. BOOK 2
PP. 67-70
6 2-3
RESPIRATION
Burning food.
The mitochondrion.
By the end of the lesson, the learner should be able to:
To describe an experiment investigating the gas given off when food is burnt.
To state functions of mitochondrion in respiration.
Teacher demonstration: Burning a food sample.
Testing for the gas evolved during combustion.
Drawing structure of the mitochondrion.
Explain function of the mitochondrion.
text book
Wall charts- The mitochond-rion
K.L.B. BK 2
PP. 73-74
K.L.B. BK 2
P. 74
6 4
RESPIRATION
Aerobic respiration.
Anaerobic respiration.
By the end of the lesson, the learner should be able to:
To explain phases of aerobic respiration.
To state difference between aerobic and anaerobic respiration.
Detailed discussion.
Writing down equations of food breakdown.
text book
Glucose
Yeast
Thermometer
K.L.B. BK 2
PP.74-76
7 1
RESPIRATION
Oxygen ?debt?.
By the end of the lesson, the learner should be able to:
To explain the term ?oxygen debt?.
To explain the effect of ?oxygen debt? on the amount of energy released during respiration.
Probing questions.

Detailed discussion.
text book
K.L.B. BK 2
P.78
7 2
RESPIRATION
Applications of anaerobic respiration.
By the end of the lesson, the learner should be able to:
To explain applications of anaerobic respiration.
Q/A: Products of fermentation process.
Listing down various applications of anaerobic respiration.
text book
K.L.B. BK 2
P. 79
7 2-3
RESPIRATION
Applications of anaerobic respiration.
Respiratory substrates & respiratory quotient.
By the end of the lesson, the learner should be able to:
To explain applications of anaerobic respiration.
To identify respiratory substrates in the body.
To define respiratory quotient.
To calculate R.Q.
Q/A: Products of fermentation process.
Listing down various applications of anaerobic respiration.

Brief discussion/ explanations.

Exposition of definition and its significance.
Problem solving.
text book
K.L.B. BK 2
P. 79
7 4
RESPIRATION
Rate of respiration.
By the end of the lesson, the learner should be able to:
To state and explain factors affecting rate of respiration.
Detailed discussion and explanations.
text book
K.L.B. BK 2
PP. 80-81
8

END OF THE YEAR EXAMINATION

9

MARKING AND CLOSING.

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