Question

Guttation occurs in well- watered herbaceous plants of well- drained soils during
A. Evening
B. Morning
C. Day
D. Noon

Answer 1

Guttation is the moisture produced during the night by plants. It is mainly triggered by root strain. Water will pool in the roots at night time in the absence of transpiration and because of high soil moisture level, it will cause root pressure. Plants emit water in the form of droplets, which is called guttation, in this state. So in well- watered herbaceous plants of well- drained soil, droplets are released during the morning period.

Complete answer:
- Evening: Guttation occurs when the soil is very wet at night and water is absorbed by the roots. Root pressure allows the water to squeeze out of the plant and onto the tips of the leaves or the blades of the plant if there is too much water. Hence option A is incorrect.
- Morning: Guttation is the loss of water in the form of a dilute solution of mineral salts by water stomata (hydathodes). Positive root pressure is built up when water absorption exceeds transpiration, i.e. when plants deliberately consume water, under the influence of which excess water simply oozes out through the dead ends of xylem tracheids and vessels. This generally occurs when perspiration is poor during the early morning hours. Hence option B is correct.
- Day: Herbaceous plants wither even in very much watered soil on a hot day on the grounds that their happening rate surpasses the pace of assimilation of water by the roots. They become limp because of less water in the cells, and the leaves become delicate and shrink. Hence option C is incorrect.
- Noon: Due to water depletion by transpiration, Wilting has occurred. Although the plant is well watered, as stomata get open under these conditions, conditions such as low humidity, high temperature, and sufficient light cause the rate of transpiration to increase. The mechanism in which water vapors are emitted from the stomatal openings is transpiration. Hence option D is incorrect.
Hence option B: Morning is the correct answer.

Note: A very significant factor is that the amount of water and nutrients they take in must be controlled by plants. The mechanism by which the amount of water they take in is balanced by plants is called guttation. Plants that have a vascular system, such as hay, wheat, tomatoes, etc. The water at the tip of the leaves accumulates in such plants.