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• What would be expected to happen if: (a) GA3 is applied to rice seedlings (b) dividing cells stop differentiating (c) a rotten fruit gets mixed with unripe fruits (d) you forget to add cytokinin to the culture medium.
  (a) GA₃ applied to rice seedlings Promotes stem (internode) elongation,...
  Sourav Pan
• Would a defoliated plant respond to photoperiodic cycle? Why?
  A defoliated plant (one with all leaves removed) will not...
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• Which 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 axillary buds (e) ‘bolt’ a rosette plant (f) induce immediate stomatal closure in leaves.
  (a) induce rooting in a twig Use an auxin such...
  Sourav Pan
• ‘Both a short day plant and a long day plant can produce can flower simultaneously in a given place’. Explain.
  Photoperiodism governs flowering: short-day plants (SDPs) flower when day length...
  Sourav Pan
• ‘Both growth and differentiation in higher plants are open’. Comment.
  Both growth and differentiation in higher plants are termed “open”...
  Sourav Pan
• Why is abscisic acid also known as stress hormone?
  Abscisic acid (ABA) is termed the "stress hormone" in plants...
  Sourav Pan
• List five main groups of natural plant growth regulators. Write a note on discovery, physiological functions and agricultural/horticultural applications of any one of them.
  Five main groups of natural plant growth regulators Auxins Gibberellins...
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