The process of guttation takes place
a. when the root pressure is high and the rate of transpiration is low.
b. when the root pressure is low and the rate of transpiration is high
c. when the root pressure equals the rate of transpiration
d. when the root pressure, as well as rate of transpiration, are high.

Solution:

Option (a) is the answer.

Guttation occurs in the absence of transpiration, particularly in low-light situations (early morning). While guttation causes water droplets to accumulate on the ends of leaves, transpiration releases water vapor. Guttation is a condition that occurs in herbaceous plants when the temperature is low.

When the root pressure is high and the rate of transpiration is low, the right answer is ‘when the root pressure is high and the rate of transpiration is low.’