Question

It hasn't rained in several days and you have forgotten to water your fern. The roots sense a lack of water and produce the hormone abscisic acid. Abscisic acid triggers the guard cells to shrink. When the guard cells shrink, the stomatal pore closes and water loss decreases which inhibits the reproductive ability of the flower.

Answer 1

Answer:Abscisic acid triggers guard cells to shrink.

Explanation:

One major activity of Abscisic acid is the *wilting of leaves*. Here, Abscisic acid produced in large amounts *interfere with the retention of potassium ions in the guard cells,thereby, causing the stomata to close*.When there is insufficient water in the plant,the Abscisic acid breaks down and the stomata pores reopen.