Formative Practice 2.5 (Form 5 Biology Textbook Exercise and Answer)


Question 1:
Give the definition of compensation point.

Answer:
Compensation point is the level of light intensity when the rate of respiration equals to the rate of photosynthesis.


Question 2:
The compensation point of fern plants which grow on the rainforest floor happens at 10.00 am. In your opinion, at what time does a ficus plant which grows higher in the same forest achieve its compensation point?

Answer:
Before 10 am, as the ficus tree is taller and thus receives higher light intensity.


Question 3:
At the compensation point, the rate of photosynthesis and cellular respiration is the same. State the effects on:
(a) The production of glucose by plants
(b) The release of oxygen into the atmosphere

Answer:
(a) Glucose produced in photosynthesis is fully used for cell respiration in plant.

(b) No oxygen is released into the atmosphere as it has been fully used for respiration.

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