Plant Hormones and Growth Regulators MCQs

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  1. Which hormone is primarily responsible for promoting cell elongation in plants? a) Gibberellins b) Auxins c) Cytokinins d) Ethylene Answer: b) Auxins
  2. What is the role of gibberellins in plant growth? a) Inhibit seed germination b) Promote fruit ripening c) Stimulate stem elongation d) Enhance leaf drop Answer: c) Stimulate stem elongation
  3. Which hormone is known as the “stress hormone” in plants? a) Auxin b) Ethylene c) Abscisic acid d) Cytokinin Answer: c) Abscisic acid
  4. What effect does cytokinins have on plant tissues? a) Promote cell division b) Inhibit cell elongation c) Induce flowering d) Stimulate root growth Answer: a) Promote cell division
  5. Which hormone is primarily involved in the ripening of fruits? a) Auxins b) Ethylene c) Gibberellins d) Abscisic acid Answer: b) Ethylene
  6. Which plant hormone is responsible for apical dominance? a) Gibberellins b) Auxins c) Cytokinins d) Ethylene Answer: b) Auxins
  7. What is the primary function of abscisic acid in plants? a) Stimulate growth b) Promote seed germination c) Induce dormancy d) Enhance photosynthesis Answer: c) Induce dormancy
  8. Which hormone is involved in promoting the development of lateral roots? a) Auxin b) Cytokinin c) Ethylene d) Gibberellin Answer: a) Auxin
  9. What is the main role of brassinosteroids in plants? a) Promote fruit ripening b) Enhance cell elongation and division c) Induce flowering d) Inhibit root growth Answer: b) Enhance cell elongation and division
  10. Which plant hormone is known to delay senescence (aging) in leaves? a) Ethylene b) Cytokinin c) Abscisic acid d) Auxin Answer: b) Cytokinin
  11. What effect does auxin have on phototropism? a) It has no effect b) It causes plants to bend toward light c) It causes plants to bend away from light d) It inhibits growth Answer: b) It causes plants to bend toward light
  12. Which hormone is primarily responsible for the elongation of stems and fruit development? a) Ethylene b) Cytokinin c) Gibberellin d) Abscisic acid Answer: c) Gibberellin
  13. In what way does ethylene influence leaf abscission? a) It promotes leaf retention b) It stimulates leaf drop c) It has no effect d) It induces flowering Answer: b) It stimulates leaf drop
  14. Which hormone is associated with seed dormancy? a) Gibberellins b) Auxins c) Abscisic acid d) Cytokinins Answer: c) Abscisic acid
  15. Which plant hormone is known for its role in stimulating flowering in long-day plants? a) Auxin b) Gibberellin c) Ethylene d) Abscisic acid Answer: b) Gibberellin
  16. What is the primary action of auxin in root development? a) Stimulate root growth b) Inhibit root growth c) Promote leaf growth d) Induce flowering Answer: a) Stimulate root growth
  17. Which hormone is produced in response to stress, such as drought? a) Ethylene b) Abscisic acid c) Gibberellin d) Cytokinin Answer: b) Abscisic acid
  18. Which growth regulator is derived from fungi and is known to promote cell elongation? a) Ethylene b) Gibberellin c) Auxin d) Cytokinin Answer: b) Gibberellin
  19. What role does cytokinins play in plant tissue culture? a) Promote leaf senescence b) Induce root formation c) Promote shoot proliferation d) Stimulate fruit ripening Answer: c) Promote shoot proliferation
  20. Which plant hormone can cause fruit to develop without fertilization, a process known as parthenocarpy? a) Auxin b) Gibberellin c) Ethylene d) Abscisic acid Answer: a) Auxin
  21. What is the effect of gibberellins on seed germination? a) Inhibit germination b) Promote germination c) Have no effect d) Cause premature germination Answer: b) Promote germination
  22. Which hormone is involved in the response to gravity in plants? a) Ethylene b) Auxin c) Cytokinin d) Abscisic acid Answer: b) Auxin
  23. How does ethylene influence the ripening of fruits? a) It inhibits ripening b) It has no effect c) It promotes ripening d) It prevents decay Answer: c) It promotes ripening
  24. Which hormone plays a role in the elongation of internodes in some plants? a) Cytokinin b) Ethylene c) Gibberellin d) Abscisic acid Answer: c) Gibberellin
  25. What is the main action of auxins in response to touch (thigmotropism)? a) They promote growth on the side away from the stimulus b) They inhibit growth on the side towards the stimulus c) They have no effect d) They promote growth uniformly Answer: a) They promote growth on the side away from the stimulus
  26. Which hormone is involved in regulating water loss during drought stress? a) Auxin b) Cytokinin c) Abscisic acid d) Ethylene Answer: c) Abscisic acid
  27. What role does jasmonic acid play in plants? a) Stimulates growth b) Involved in defense responses c) Promotes flowering d) Enhances photosynthesis Answer: b) Involved in defense responses
  28. Which hormone is known to promote seed development and maturation? a) Auxin b) Gibberellin c) Ethylene d) Abscisic acid Answer: d) Abscisic acid
  29. Which plant hormone can be used to induce flowering in short-day plants? a) Cytokinin b) Gibberellin c) Auxin d) Ethylene Answer: b) Gibberellin
  30. What is the primary function of strigolactones in plants? a) Promote seed germination b) Regulate shoot branching c) Stimulate root growth d) Enhance leaf senescence Answer: b) Regulate shoot branching
 
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