NEET 1990 · Class 11

Plant Growth and Development

Abscisic acid controls

  1. (A)cell division
  2. (B)leaf fall and dormancy
  3. (C)shoot elongation
  4. (D)cell elongation and wall formation

The NCERT line that answers it

Verbatim line

As mentioned earlier, abscisic acid (**ABA**) was discovered for its role in regulating abscission and dormancy.

Chapter
Plant Growth and Development
Section
13.4.3 Physiological Effects of Plant Growth Regulators

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 ABA was discovered for its role in regulating abscission (leaf fall) and dormancy, which directly matches option B.

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