Formative Practice 2.3 (Form 5 Biology Textbook Exercise and Answer)

Question 1:
What is the meaning of transpiration?
State the relationship between transpiration and stomata.

Transpiration is a process of water loss in the form of water vapour through evaporation from the plants to the atmosphere. Transpiration occurs in stomatal pore.

Question 2:
Other than higher temperature and faster air movement, light intensity also affects the rate of transpiration. Explain.

When the light intensity is high, the temperature of the surrounding also increases. This causes the water vapour in the air to evaporate and there is more space to be filled up by the water vapour that evaporates from the leaf. Hence, the higher the light intensity, the higher the rate of transpiration.

Question 3:
A plant X was submerged in flood for two days. When the water subsided, the leaves of plant X were covered with mud.
How does this condition affect the rate of transpiration? Explain.

Mud that sticks to the lower leaf will close the stomatal pore and this will reduce the rate of transpiration.

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