A) Munch theory
B) starch glucose theory
C) Steward?s theory
D) active K+ transport theory
Correct Answer: D
Solution :
The latest explanation for closure of stomata is active
transport theory put forward by Fujino) 1967). According to this leaf is exposed to light then malic acid appears in guard cells. Malic acid get dissociated into malate and 
. The are exchanged with . The starch-glucose theory was given by Lloyd (1908). According to this theory turgidity of guard cells depends upon inter conversion of starch and sugar (glucose). Steward (1964) said the enzymes like phosphorylase, phosphoglucomutase, phosphatase and hexokinase are present in guard cells and help in opening and closing of stomata. Munch theory (mass flow hypothesis) states that the organic substances move in the sieve tubes from the region of high osmotic concentration to the region of low concentration in a mass flow i.e., the starch move from leaves to stem and roots.
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