NEET 2022 Re · Class 11

Plant Growth and Development

Which of the following growth regulators is an adenine derivative?

  1. (A)Abscisic acid
  2. (B)Auxin
  3. (C)Cytokinin
  4. (D)Ethylene

The NCERT line that answers it

Verbatim line

Cytokinins have specific effects on cytokinesis, and were discovered as kinetin (a modified form of adenine, a purine) from the autoclaved herring sperm DNA.

Chapter
Plant Growth and Development
Section
13.4.3 Physiological Effects of Plant Growth Regulators
Page
10
Words matched
24 of 24

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

0, emb=1.0, combined=1.0). Verified: high — The span explicitly states that cytokinin (kinetin) is 'a modified form of adenine, a purine,' which directly answers the question about which growth regulator is an adenine derivative.

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Question text is reproduced from the published NEET 2022 Re paper for study and commentary. NCERT text is quoted, not redistributed; textbooks remain at ncert.nic.in. Our mapping method, including its measured error rates, is published at /methodology.