Question

WHAT IS THE MAIN FUNCTION OF:
Auxin.
Cytokinins.
Gibberellins.
Abscisic Acid.
Ethylene
GUYS...NO SILLY ANS PLS..............

Answer 1

Auxins:
Auxins promote stem elongation, inhibit growth of lateral buds (maintains apical dominance). They are produced in the stem, buds, and root tips. Example: Indole Acetic Acid (IA). Auxin is a plant hormone produced in the stem tip that promotes cell elongation.
Cytokinins:
Cytokinins (CK) are a class of plant growth substances (phytohormones) that promote cell division, or cytokinesis, in plant roots and shoots. They are involved primarily in cell growth and differentiation, but also affect apical dominance, axillary bud growth, and leaf senescence.
Gibberellins :
Gibberellins are growth hormones that stimulate cell elongation and cause plants to grow taller. Gibberellins also have a role in other plant processes, such as stem elongation, germination, flowering, and fruit ripening.
Abscisic acid:
Abscisic acid owes its names to its role in the abscission of plant leaves. In preparation for winter, ABA is produced in terminal buds. This slows plant growth and directs leaf primordia to develop scales to protect the dormant buds during the cold season.
Ethylene :
Ethylene serves as a hormone in plants. It acts at trace levels throughout the life of the plant by stimulating or regulating the ripening of fruit, the opening of flowers, and the abscission (or shedding) of leaves.

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Answer 2

Auxin promotes cell division and cell elongation promotes fruit growth
Gibberellins promotes cell enlargement and cell differentiation in presence of auxin and breaks dormancy of seed
Cytokinins delay ageing of leaves opening of stomata
Abscic acid promotes dormancy of seed promotes closing of stomata promotes wilting and falling of leaves