Question

Water is pulled upward against the xylem due to gravity because of

• A. Root pressure
• B. Rhythmic pulsation
• C. Transpiration pull
• D. None of the above

Answer 1

The correct option is C Transpiration pull

Root pressure can only push water upto a small height but the water is mainly transported in the xylem because of transpiration pull.

Transpiration pull is caused by the loss of water in the form of water vapour through the Stomata and this creates a negative pressure. This helps water to move upwards against gravity.

Rhythmic pulsation is not seen in plants.

So, the correct answer is 'Transpiration pull'