Question

The main function of abscisic acid in plants is to:
A) Increase the length of cells.
B) Promote cell division.
C) Inhibit growth.
D) Promote growth of stem.

Answer 1

Abscisic acid $(C_15H_20 O_4)$ is the plant hormone, which is answerable for torpidity of seeds and restraint of seeds. It invigorates the conclusion of stomata, hinders shoot development, animate the capacity of proteins in seeds, etc.

Complete answer:
Abscisic acid (ABA) is a plant hormone. ABA capacities in many plant formative cycles, including seed and bud lethargy, the control of organ size and stomatal conclusion. It is additionally created in the roots in light of diminished soil water potential and different circumstances in which the plant might be under pressure. It assumes a significant part in enduring abiotic stress.

There are different formative and physiological cycles where ABA assumes a basic job:

ABA invigorates conclusion of stomata during high saltiness, water pressure and diminishes water misfortune by happening. ABA communicates with different phytohormones like Jasmonates, nitric oxide and flagging particles to initiate stomatal conclusion.
ABA prompts seed lethargy and accordingly causes seeds to withstand parching and other troublesome conditions for the development. Seeds can be kept away for a more extended term.
ABA assumes a significant function in the development and change of root during nitrogen lack and dry spell. It manages the quality articulation, required for root development upkeep and water take-up.
ABA controls protein-encoding qualities and biosynthesis of lipids and capacity proteins.
ABA assumes a fundamental part during signal transduction pathway during the pressure reaction.
Abscisic corrosive is associated with the blend of dehydrins, osmoprotectants and defensive proteins.
ABA animates long haul development by controlling pressure responsive qualities.
By performing all these functions in plants, abscisic acid overall contributes in the inhibition of plant growth.

Therefore, the correct answer is C, i.e. Inhibit growth.

Note: Abscisic corrosive is likewise called the pressure hormone on the grounds that the union of the hormone is invigorated by natural anxieties like dry spell, water logging and so on.