Question

Transpiration and root pressure cause water to rise in plants by:

• A. Pulling and pushing it, respectively
• B. Pushing and pulling it, respectively
• C. Pushing it upward
• D. Pulling it upward

Answer 1

The correct option is A

Pulling and pushing it, respectively

The correct option is A.

Explanation of the correct option:

1. The process of transpiration develops a negative water vapor pressure, which develops in the cells of leaves.
2. Water is pulled up in transpiration through the xylem.
3. Root pressure refers to the positive hydrostatic pressure which develops in the root xylem.
4. Root pressure causes water to get pushed upwards.

Explanation of the incorrect options:

Option B:

Transpiration causes water to pull upwards whereas, root pressure causes it to rise by pushing.

Option C:

Only the root pressure causes water to rise by pushing it, transpiration causes the pulling of water.

Option D:

Transpiration causes the water to rise by pulling it upwards, root pressure tends to push the water.

Final answer: Transpiration and root pressure cause water to rise in plants by pulling and pushing it, respectively.