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The Fundamental Unit of Life — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceThe Fundamental Unit of Life1 Mark
MCQ
Nucleus is absent in one of the following.
  • A
    Companion cell.
  • B
    Seive tube cell.
  • C
    A vessel and tracheid.
  • ✓
    Both B and C.
✓

Answer

Correct option: D.
Both B and C.

A cell usually contains a single nucleus. However, binucleate (eg. Paramecium caudatum), trinucleate (eg. Paramecium aurelia) and multinucleate forms also occur. But in some cell nucleus is absent such as mammalian RBCs and sieve tube cells. They are called anucleate cells. In plants, xylem tracheids and vessels are nonliving and hence they also lack a functional nucleus.

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