Question

The force responsible for raising water in 100 ft tall plant is

• A. Transpiration pull
• B. Root pressure
• C. Air pressure
• D. Capillary action

Answer 1

The correct option is A Transpiration pull

The force responsible for raising water in 100 ft tall plant is transpirational pull. The rate of transpiration is high on a bright sunny day. The water is lost from guard cell which leads to decrease in the water potential of guard cell as compared to the surrounding cell. To stabilize the water potential in the guard cell water rushes from the neighboring cell which creates a cohesion pull in the xylem vessels to pull the water up to the guard cell. Thus, the rate of water absorption increases when the transpiration is high.

So, the correct answer is option A.