Question

Root pressure in maximum, when

• A. Transpiration is high and absorption is very low.
• B. Transpiration is very low and absorption is high.
• C. Absorption is very high and transpiration is also very high.
• D. Absorption is very low and transpiration is also low.

Answer 1

Answer: (B)

Transpiration is very low and absorption is high.

When transpiration is low and soil is generally well watered, a positive root pressure develops. Under the influence of positive root, pressure water oozes out from ends of xylary elements in plants. The main reason for the development of positive root pressure is the active absorption of minerals and water by roots.

So, the correct answer is option B.