Multiple choice

Directions: The following item consists of two statements, one labelled as 'Assertion (A)' and the other labeled as 'Reason (R)'. You are to examine these two statements carefully and decide if the Assertion (A) and the Reason (R) are individually true and if so, whether the reason is the correct explanation of the Assertion. Select your answer using the codes given below.

Assertion (A): The water and minerals absorbed by the roots of tall trees ascend to the highest aerial parts against the gravitational force. Reason (R): Root pressure helps this process of ascent of sap in tall trees.

  1. Both (A) and (R) are true and (R) is the correct explanation of (A).

  2. Both (A) and (R) are correct but (R) is not the correct explanation of (A).

  3. (A) is true but (R) is false.

  4. (A) is false but (R) is true.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The water and minerals absorbed by the roots of tall trees ascend to the highest aerial parts against the gravitational force as root pressure helps this process of ascent of sap in tall trees. As a result of transpiration pull, the water column found in xylem elements is virtually pulled upwards and outwards from one end, but the same water column is also subjected to another opposing force called gravitational pull. 

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