NEET 1989 · Class 11

Plant Growth and Development

Leaf fall can be prevented with the help of

  1. (A)abscisic acid
  2. (B)auxins
  3. (C)florigen
  4. (D)cytokinins

The NCERT line that answers it

Verbatim line

They help to prevent fruit and leaf drop at early stages but promote the abscission of older mature leaves and fruits.

Chapter
Plant Growth and Development
Section
13.4.3 Physiological Effects of Plant Growth Regulators
Page
9
Words matched
21 of 21

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 'They help to prevent fruit and leaf drop at early stages', which directly matches the MCQ's requirement about preventing leaf fall and identifies auxins as the responsible hormone.

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Question text is reproduced from the published NEET 1989 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.