Transport in Plants Question 12
12. Which one gives the most valid and recent explanation for stomatal movements?
(a) Potassium influx and efflux
(b) Starch hydrolysis
(c) Guard cell photosynthesis
(d) Transpiration
Show Answer
Answer : a
Hints & Solutions
(a) The opening and closing of stomata are caused by influx and efflux of potassium ions $(K^{+})$. The increase of $K^{+}$results in opening of stoma and decrease of $K^{+}$causes closing of stoma. The turgidity of guard cells induces the opening of the pores of stomata found on the surface of leaves.
