passwella.
Menu

JAMB Biology 2007 Question 24

Question 24

Cell and Its Environment

The opening and closing of the stoma are regulated by

  1. A.transpiration
  2. B.respiration
  3. C.diffusion
  4. D.osmosis.
Show the answer and explanation

Answer: D (osmosis.)

Explanation

Water enters the guard cells by osmosis, making them turgid so the pore opens. When they lose water they become flaccid and the pore closes.