NEET 2009 · Class 11

Plant Growth and Development

One of the synthetic auxin is

  1. (A)IAA
  2. (B)GA
  3. (C)IBA
  4. (D)NAA

The NCERT line that answers it

Verbatim line

NAA (naphthalene acetic acid) and 2, 4-D (2, 4-dichlorophenoxyacetic) are synthetic auxins.

Chapter
Plant Growth and Development
Section
13.4.3 Physiological Effects of Plant Growth Regulators
Page
9
Words matched
7 of 12

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 'NAA (naphthalene acetic acid) ... are synthetic auxins', which directly answers the MCQ asking for a synthetic auxin and distinguishes NAA from natural auxins like IAA and IBA.

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Question text is reproduced from the published NEET 2009 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.