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Q.

Given below are two statements:
Statement-I : The forces generated by transpiration can lift a xylem-sized column of water over 130 meters height.
Statement-II : Transpiration cools leaf surfaces sometimes 10 to 15 degrees, by evaporative cooling.
In the light of the above statements, choose the most appropriate answer from the options given below:

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a

Statement I is incorrect but statement II is correct.

b

Both statement I and statement II are correct.

c

Statement I is correct but statement II is incorrect.

d

Both statement I and statement II are incorrect.

answer is B.

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Detailed Solution

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Both statement I and statement II are correct.
SI: Transpiration generates the forces that lift a column of water in xylem up to a height of 130 metres or more in some tall trees. This phenomenon is called the cohesion-tension theory.
SII: Transpiration creates a water potential gradient from the soil to the atmosphere through the plant, causing water to move from roots to leaves. During this process, water molecules in the leaf evaporate into the atmosphere, which removes heat energy from the leaf and cools it down. This is called evaporative cooling. This cools leaf surfaces, sometimes by 10 to 15 degrees.

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