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Plant Growth Regulators or Phytohormones MCQ - Practice Questions with Answers
Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET
Quick Facts
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29 Questions around this concept.
Solve by difficulty
Which of the following is not phytohormones ?
Match the following concerning the activity/function and the phytohormone involved.
| (a) Fruit ripener | (i) Abscisic acid |
| (b) Herbicide | (ii) GA3 |
| (c) Bolting agent | (iii) 2, 4-D |
| (d) Stress hormone | (iv) Ethephon |
Select the correct option from the following:
Application of which of the following pairs of hormones will inhibit the growth of a plant?
Which one is paired incorrectly?
Concepts Covered - 1
Plant Growth Regulators or Phytohormones
- The plant growth regulators (PGRs) are small, simple molecules of diverse chemical composition.
- They could be indole compounds (indole-3-acetic acid, IAA); adenine derivatives (N6 -furfurylamine purine, kinetin), derivatives of carotenoids (abscisic acid, ABA); terpenes (gibberellic acid, GA3) or gases (ethylene, C2H4).
- The PGRs can be broadly divided into two groups based on their functions in a living plant body:
- Growth promoting such as mediating cell division, cell enlargement, pattern formation, tropic growth, flowering, fruiting and seed formation.
- Growth inhibiting such as mediating responses to wounds and stresses of biotic and abiotic origin.
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