Question

What are the five plant hormones?

Answer 1

5 plant hormones:

Auxin :

Auxin generates a variety of reactions in plants, including:

1. Bending in the direction of a light source (phototropism).
2. Gravity-induced downward root growth (geotropism).
3. Apical dominance promotion (the tendency of an apical bud to produce hormones that suppress the growth of the buds below it on the stem).

Gibberellins:

1. Gibberellins promote cell division and elongation, as well as seed dormancy and germination.
2. Some species' seeds are difficult to germinate; soak them in a GA solution to get them started.

Cytokinins:

1. Cytokinins, unlike other hormones, are present in both plants and mammals.
2. They promote cell proliferation and are frequently found in the sterile medium used to grow plants from tissue culture.

Ethylene:

1. Ethylene is unusual in that it can only be found in gaseous form.
2. It accelerates senescence by causing leaves to droop (epinasty) and drop (abscission).
3. In reaction to stress, plants frequently increase ethylene synthesis, and ethylene is frequently discovered in high concentrations within cells near the conclusion of a plant's life.

Abscisic acid :

1. Abscisic acid (ABA) is a plant growth inhibitor in general.
2. It produces dormancy and inhibits seeds from germinating; causes leaf, fruit, and flower abscission; and causes stomata to shut.