Transport in Plants Question 50
50. Conversion of starch to organic acids is required for
[1992]
(a) stomatal opening
(b) stomatal closing
(c) stomatal formation
(d) stomatal activity
Show Answer
Answer : a
Hints & Solutions
(a) Starch is converted to malic acid (organic acid) through the action of an enzyme phosphoenol pyruvate carboxylase (PEPC) under condition of high $pH$ when most of the $CO_2$ is utilized due to high photosynthetic rate during daytime.
