S6.UACE BIOLOGY HIGH MOCK EXAMINATION 2020
BIOLOGY PAPER 2
(Theory)
2 Hours 30 Minute
Section B (60 Marks)
2. a) Describe positive feedback mechanism with reference to;
i) Propagation of an action potential by the neuron,
ii) Parturition (15marks)
b) Outline three advantages and two disadvantages of viviparity over oviparity. (05marks)
3. a) Explain how variation in light intensity affects exchange of gases between the leaf cells
and the atmosphere (10marks)
b) Describe how non specificity of photosynthetic enzymes affects productivity. (10marks)
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Section B (60 Marks)
2. a) Describe positive feedback mechanism with reference to;
i) Propagation of an action potential by the neuron,
ii) Parturition (15marks)
b) Outline three advantages and two disadvantages of viviparity over oviparity. (05marks)
3. a) Explain how variation in light intensity affects exchange of gases between the leaf cells
and the atmosphere (10marks)
b) Describe how non specificity of photosynthetic enzymes affects productivity. (10marks)
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