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  4. Plant Growth Regulators or Phytohormones MCQ - Practice Questions with Answers

Plant Growth Regulators or Phytohormones MCQ - Practice Questions with Answers

Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET

Quick Facts

  • 29 Questions around this concept.

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QuestionEASY

Which of the following is not phytohormones ?

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Application of which of the following pairs of hormones will inhibit the growth of a plant?
 

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Which one is paired incorrectly?

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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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Plant Growth Regulators or Phytohormones

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