Which of the following is an incorrect statement?

Which of the following is an incorrect statement?

  1. Mature sieve tube elements possess a conspicuous nucleus and usual cytoplasmic organelles.
  2. Microbodies are present both in plant and animal cells.
  3. The perinuclear space forms a barrier between the materials present inside the nucleus and that of the cytoplasm.
  4. Nuclear pores act as passages for proteins and RNA molecules in both directions between nucleus and cytoplasm.

Solution

A mature sieve element possesses a peripheral cytoplasm and a large vacuole but lacks a nucleus. The functions of sieve tubes are controlled by the nucleus of companion cells. The companion cells are specialised parenchymatous cells, which are closely associated with sieve tube elements.

Asked in: NEET 2021

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