NEET 1991 · Class 11

Plant Growth and Development

Abscisic acid causes

  1. (A)stomatal closure
  2. (B)stem elongation
  3. (C)leaf expansion
  4. (D)root elongation

The NCERT line that answers it

Verbatim line

ABA stimulates the closure of stomata and increases the tolerance of plants to various kinds of stresses.

Chapter
Plant Growth and Development
Section
13.4.3 Physiological Effects of Plant Growth Regulators
Page
11
Words matched
17 of 17

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 'ABA stimulates the closure of stomata', which directly matches the correct answer 'stomatal closure' and distinguishes it from the other options.

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Question text is reproduced from the published NEET 1991 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.