Question

The theory proposed to explain the mechanism of stomatal movement?

• A. The starch-sugar interconversion theory
• B. Theory of photosynthesis in guard cell
• C. Theory of glycolate metabolism
• D. Active potassium transport ion concept

Answer 1

Answer:

A. The starch-sugar interconversion theory

• Steward in 1964 proposed a modified scheme of inter-conversion of starch and sugar for stomatal movement.

• Theory of photosynthesis in guard cells was given by Von Mohl in 1856 and proposed that chloroplasts in the guard cells photosynthesize leading to production of sugar.

• Theory of glycolate metabolism was given by Zelitch in 1963 and he proposed that production of glycolic acid in the guard cells is a necessary factor in stomatal opening.

• Active Potassium Pump theory was given by Fujino. Levitt & Rashke in 1975 supported the theory of the K+ ion transport active mechanism requires ATP.