NEET 2020 · Class 12

Organisms and Populations

Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their

  1. (A)Growth response
  2. (B)Defence action
  3. (C)Effect on reproduction
  4. (D)Nutritive value

The NCERT line that answers it

Verbatim line

A wide variety of chemical substances that we extract from plants on a commercial scale (nicotine, caffeine, quinine, strychnine, opium, etc.,) are produced by them actually as defences against grazers and browsers.

Chapter
Organisms and Populations
Section
11.1.4 Population Interactions
Page
10
Words matched
32 of 32

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

0, emb=0.6558, combined=0.7935). Verified: high — The span explicitly states that nicotine, caffeine, and strychnine are 'produced by them actually as defences against grazers and browsers,' which directly and conclusively supports option B (Defence action).

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 2020 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.