Question

*The enzyme responsible for interconversion of sugar into starch during stomatal
movement is
A) Catalase
B) Phosphorylase
C) Dehydrogenase
D) Atlase
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Answer 1

Answer:

b) phosphorylase

Explanation:

The discovery of enzyme phosphorylase in guard cells by Hanes (1940) greatly supports the starch-sugar interconversion theory. The enzyme phosphorylase hydrolyses starch into sugar and high pH followed by endosmosis and the opening of stomata during light.

Answer 2

Answer:

B) enzyme phosphorylase

This hypothesis was further supported by detection of the enzyme phosphorylase in guard cells by Yin and Tung (1948). This enzyme is responsible for starch-glucose interconversion.

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