Adenine derivative is

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  1. ABA
  2. Auxin
  3. Cytokinin/Kinetin
  4. GA

Answer (Detailed Solution Below)

Option 3 : Cytokinin/Kinetin
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The correct answer is Cytokinin/Kinetin

Explanation:

  • 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 -furfurylamino purine, kinetin), derivatives of carotenoids (abscisic acid, ABA); terpenes (gibberellic acid,GA3) or gases (ethylene, C2H4).
  • Adenine derivatives are a class of plant hormones that include cytokinins. These compounds are derived from the adenine molecule, which is one of the four nucleotides in DNA and RNA.
  • Cytokinins are involved in various plant growth processes such as cell division, shoot and root growth, and the delay of senescence (aging).
  • Kinetin is one of the most well-known cytokinins and was the first to be discovered. It is used in tissue culture to stimulate cell division.

Other Options:

  • ABA (Abscisic Acid): This is a plant hormone involved in many plant developmental processes, including seed dormancy, leaf senescence, and response to environmental stress. It is a derivative of carotenoids.
  • Auxin: This is another class of plant hormones that play a critical role in the regulation of plant growth and development, particularly in cell elongation and the directional growth of roots and shoots. 
  • GA (Gibberellins): These are a group of plant hormones that regulate growth and influence various developmental processes, including stem elongation, germination, and flowering. It is classified as a terpene.
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