Question

When an oak leaf stoma is open more widely, the most likely process involved is

• A. Water molecule are entering in the guard cells through adjacent cells.
• B. The atmosphere outside the stoma is becoming less humid.
• C. Salts molecule are being excreted by the adjacent guard cells.
• D. Auxins are accumulating in the guard cells.

Answer 1

Answer: (A)

Water molecule are entering in the guard cells through adjacent cells.

The stomata opens, when guard cells become turgid due to movement of water from surrounding subsidiary cells to the guard cells. The stomata close down, when water moves out from guard cells and cells they become flaccid.