Formative Practice 2.2 (Form 5 Biology Textbook Exercise and Answer)

Question 1:
State the differences of gaseous exchange in plants during respiration and photosynthesis.

Respiration – Oxygen is absorbed and carbon dioxide is released
Photosynthesis – Carbon dioxide is absorbed and oxygen is released

Question 2:
How does humidity in the surroundings affect the size of the stomatal opening?

The humid surroundings causes the size of the stoma to become larger. The excess water vapour in the air reduces the loss of water from the leaf.

Question 3:
The stomatal distribution on the lower leaf surface is more packed as compared to the upper leaf surface. Justify.

The stomatal distribution is more packed on the lower leaf surface because the lower leaf is not expose directly to the sunlight. This can prevent excessive loss of water.

Question 4:
What is the importance of stomatal closure when the plant lacks water?

To prevent excessive loss of water through transpiration.

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