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JAMB Biology 1997 Question 20

Question 20

Cell and Its Environment

Stomatal pores open when there is

  1. A.an increase in the sugar content of guard cellls
  2. B.a decrease in the osmotic concentration of guard cells
  3. C.a decrease in the sugar content of mesophyll cells
  4. D.an increase in the sugar content of mesophyll cells.
Show the answer and explanation

Answer: A (an increase in the sugar content of guard cellls)

Explanation

More sugar in the guard cells draws in water by osmosis; they swell, curve apart and the pore opens.