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Q.

Which of the following growth regulators is an adenine derivative?   

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a

Cytokinin

b

Auxin

c

Abscisic acid 

d

Ethylene

answer is B.

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Detailed Solution

detailed_solution_thumbnail

Cytokinins are a class of plant growth regulators (phytohormones) which are derived from adenine, a nitrogenous base
found in DNA and RNA.

(1) Auxins could be indole compounds. 

(3) The precursor of ethylene in plants is the amino acid methionine.

(4) Abscisic acids are derivatives of carotenoids.

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