Cell walls is found in
(a) plant cells only
(b) animal cells only
(c) both (a) and (b)
(d) none of them

Correct Answer: (a) plant cells only

Explanation:

 A cell wall is the outermost, structural layer surrounding plant cells and certain microbes. It is present outside the cell membrane. Its main function is to provide structural support to the cell, provide protection and act as a filter.

Cell wall composition varies depending on the organism.

In plants, it is composed mainly of strong fibers made of the carbohydrate polymer cellulose.

Cellulose is the major component of cotton fiber and wood, and it is used in paper production. Bacterial cell walls are composed of sugar and an amino acid polymer called peptidoglycan. The main components of fungal cell walls are chitin, glucans, and proteins.