Question

Assertion : During the night the effect of root pressure in transport of water is more important.
Reason : Stomata is open during day, transpiration takes place which help in transport of water.
(a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
(c) Assertion is true but Reason is false.
(d) Both Assertion and Reason are false.​

Answer 1

Assertion and Reason

Explanation:

Assertion : During the night the effect of root pressure in transport of water is more important.

Reason : Stomata is open during day, transpiration takes place which help in transport of water.

Both Assertion and reason are true but reason is  not the correct explanation of assertion  so option b is correct

• Stomata are pores present in the leaf.  It allows the exchange of gas where carbon dioxide enters and water vapor exits from the  plant.
• Stomata have guard cells that control the opening or closing of each pore. When stomata are open, during date-time, transpiration increases; when they are closed, transpiration decreases.

• Stomata are closed during nighttime. So the effect of root pressure for the transport of water is important at night time.
• In all plants, the water movement occurs mainly due to transpiration pull and root pressure. Because of the opening of stomata, transpiration occurs more in the daytime than in night time.

• During the nighttime, without sunlight, transpiration doesn't occur and the water cannot reach the leaves without transpiration pull which results in the pressure from the roots to absorb the water from the soil.

Answer 2

Answer:

Both Assertion and Reason are true and R is correct explaination of A.