Plant Growth and Development

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Q1. Ethylene exhibits its characteristic triple response in seedlings, which includes:
  • Inhibition of stem elongation, thickening of the stem, and horizontal growth.
  • Increased leaf expansion, root elongation, and faster seed germination.
  • Acceleration of flowering, increased transpiration, and decreased chlorophyll content.
  • Suppression of fruit ripening, promotion of seed dormancy, and increased stomatal closure.
Q2. Consider the two statements:
Assertion (A): Gibberellins are used to increase the length of grape stalks.
Reason (R): Gibberellins help overcome apical dominance.

 

  • Both(A)and(R)are True and(R)correctly explains(A).
  • Both(A)and(R)are True but(R)does not correctly explain(A).
  • (A)is True;(R)is False.
  • (A)is False;(R)is True.