AP BIOLOGY

PLANTS

TRANSPORT IN PLANTS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Assertion:The loss of water in its liquid phase from the leaves is called guttation.Reason:Guttation takes place at night only.
A
Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
B
Both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.
C
Assertion is true but Reason is false.
D
Both Assertion and Reason are false
Explanation: 

Detailed explanation-1: -So, the correct answer is ‘Assertion is correct but Reason is incorrect’.

Detailed explanation-2: -Plants lose water in the liquid form through the process of guttation and bleeding. Guttation exudes water through pores called hydathodes. Bleeding happens through the cut surface of plants. Transpiration is the loss of water vapor from the aerial parts of the plant.

Detailed explanation-3: -Solution : Guttation is loss of water in liquid from uninjured part of plants. This water loss occurs through the hydathodes. Guttation usually occurs from tips and margins of leaves during early morning when there is high atmospheric humidity as during wet seasons.

Detailed explanation-4: -Guttation usually occurs in the plants growing in the warm and humid climate. It usually occurs during night or in the morning when the absorption of water exceeds that of the transpiration. Due to which, root pressure is increased in xylem and water comes out through hydathodes.

Detailed explanation-5: -The loss of water as droplets from the margin or tip of leaves of some plants is known as guttation. It takes place through small stomata-like pores called hydathodes. High pressure exerted by roots also causes this phenomenon, which pushes the xylem sap to move out through the hydathodes.

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