Question

Coversion of starch to organic acid is essential for a stomatal closure b stomatal opening c stomatal initiation d stomatal growth

Answer 1

The answer is

b) stomatal opening

Answer 2

stomatal opening                                                                                                     The starch hydrolyse into glucose 1 -phosphate so that, osmotic potential becomes lower in guard cells. As a result of this water enters into the guard cell by osmotic diffusion from surrounding epidermal and mesophyll cells. Guard cells become turgid and stomata will open. The starch-sugar interconversion theory about the mechanism of stomatal movement was given by Seyere (1923) and modified by Steward (1964).