Question

Enlist the categories of photohormones. Write at least two uses each.​

Answer 1

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These are plant hormones . the organic substances which are produced in the plants .They bring about total control over growth and other physiological functions in the organism.  These hormones are otherwise called as growth regulators. Different growth regulators present in the plant are Auxins, Gibberillins, Cytokinins, Ethylene and Abscisic acid.


About classification of hormones :-

=> Auxins are the hormones synthesised at the tip of the stem. These help the plant in growth by cell elongation. 

=> Gibberellins are hormones that help in the growth of the stem, seed germination, bolting, and flowering. 

=> Cytokinins are hormones present in the areas of rapid cell division, such as fruits and seeds. They also promote the opening of the stomata. 

=> Ethylene is the hormone which brings in the ripening of fruits.