Question

Which of the following is a function of abscisic acid?

• A. Helps to overcome dwarfism in genetically dwarf plants.
• B. Promotes flowering
• C. Promotes bolting
• D. Promotes closure of stomata

Answer 1

The correct option is D Promotes closure of stomata

Abscisic acid is a plant growth inhibitor. It is also called as stress hormone. Plants lose water through the stomatal pores present in the leaves. During drought, plants produce and accumulate abscisic acid in large quantities in the guard cells. This promotes closure of stomata and the rate of transpiration is reduced.

Gibberellins is a plant growth promoter that helps to overcome dwarfism in genetically dwarf plants.
Auxin is a plant growth hormone that helps in flowering. Gibberellin is a plant growth promoter that stimulates elongation of the inter node just before flowering also called as bolting.