NEET 1993 · Class 11

Plant Growth and Development

The hormone produced during adverse environmental conditions is

  1. (A)benzyl aminopurine
  2. (B)bichlorophenoxy acetic acid
  3. (C)ethylene
  4. (D)abscisic acid

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
25 of 25

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 and increases the tolerance of plants to various kinds of stresses' and the full paragraph confirms 'Therefore, it is also called the stress hormone,' which directly matches the MCQ's requirement for a hormone produced during adverse environmental conditions.

We did this for 1,565 questions.

Every one traced to the exact sentence in NCERT that answers it, including 90% of the 2026 paper. Sit a mock on the real NEET 2027 computer interface and every mark you drop comes back with its line attached.

Take the free 5-minute checkMore from this chapter

Question text is reproduced from the published NEET 1993 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.