NEET 2018 · Class 12

Sexual Reproduction in Flowering Plants

Pollen grains can be stored for several years in liquid nitrogen having a temperature of

  1. (A)-120°C
  2. (B)-80°C
  3. (C)-160°C
  4. (D)-196°C

The NCERT line that answers it

Verbatim line

It is possible to store pollen grains of a large number of species for years in liquid nitrogen ( $-196^{\circ}\text{C}$ ).

Chapter
Sexual Reproduction in Flowering Plants
Section
1.2.1 Stamen, Microsporangium and Pollen Grain
Page
7
Words matched
18 of 19

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 pollen grains can be stored for years in liquid nitrogen at -196°C, which directly matches the correct answer and distinguishes it from all other options.

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Question text is reproduced from the published NEET 2018 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.