NEET 1997 · Class 11

Cell: The Unit of Life

At maturity, which of the following is nonnucleated? (1997)

  1. (A)Palisade cell
  2. (B)Cortical cell
  3. (C)Sieve cell
  4. (D)Companion cell

The NCERT line that answers it

Verbatim line

Some mature cells even lack nucleus, e.g., erythrocytes of many mammals and sieve tube cells of vascular plants.

Chapter
Cell: The Unit of Life
Section
8.5.10 Nucleus
Page
15
Words matched
18 of 18

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

How this line gives the answer

0, emb=0.9758, combined=0.5855). Verified: high — The span explicitly states that 'sieve tube cells of vascular plants' lack a nucleus at maturity, which directly matches the correct answer 'Sieve cell' and distinguishes it from the other options.

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Question text is reproduced from the published NEET 1997 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.