NEET BIOLOGY

Detailed explanation-1: -According to Lloyd the stomatal movement is regulated by interconversion of starch and organic acids. When starch is converted into organic acid in the presence of enzymes and light, guard cells get turgidity and eventually causes the opening of stomata.

Detailed explanation-2: -The conversion of starch to organic acid is essential for stomatal.

Detailed explanation-3: -Notes: For keeping the stomata open a constant expenditure of energy is required. This is required for conversion of starch to sugar. The stomatal opening is, in turn, related to transpiration which is the evaporation of water from plants.

Detailed explanation-4: -Malic acid was higher in the palisade parenchyma from the leaflet with open stomata. The ion balance shows that malic and citric acids provide much of the counter ion for the K(+) taken up during stomatal opening.

Detailed explanation-5: -When sugar is converted into starch in guard cells, the stomatal pores completely close. Carbon dioxide liberated during the process of respiration gathers during the nighttime. The guard cell’s acidity increases while the pH decreases. The decreased pH promotes the sugar to starch conversion.