Question

What is nucleus!
(a) Define cell wall and write its function.
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Answer 1

Explanation:

A cell wall is a structural layer surrounding some types of cells, just outside the cell membrane. It can be tough, flexible, and sometimes rigid. It provides the cell with both structural support and protection, and also acts as a filtering mechanism.

Answer 2

Nucleus is the control room of the cell it is the crucial organ in the cell

Cell wall: It protects the cell from the outside environment and it is present only in the plant cell