Short Answer Type
Long Answer TypeShort Answer TypeLong Answer TypeThe main five groups of plant growth regulators (PGRs) are :
1. Auxins
2. Cytokinins
3. Gibberellins
4. Ethylene
5. Abscisic acid.
Auxin -
Physiological functions of auxins are:
1. They help to initiate and enhance rootings in the stem cuttings.
2. They promote flowering in certain plants like pineapple.
3. They prevent the leaf and fruit drop at early stages. They promote abscission of older or mature leaf and fruit.
4. They induce apical dominance.
5. They are responsible for tropic movements.
Horticultural/Agricultural importance:
1. They induce parthenocarpy in plants like tomatoes..
2. They are used as weedicides that kill dicotyledenous weeds.
Short Answer TypeLong Answer Type
One Word AnswersWhich one of the plant growth regulators would you use if you are asked to :
(a) Induce rooting in a twig
(b) quickly ripen a fruit
(c) delay leaf senescence
(d) induce growth in axilliary buds
(e) ‘bolt’ a rosestte plant.
(f) induce immediate stomatal closure in leaves.
Switch
