Question

1) What are the differences between unicellular and multicellular organisms.

2) Why cell wall is essential in plants?​

Answer 1

Unicellular organisms are made up of only one cell that carries out all of the functions needed by the organism, while multicellular organisms use many different cells to function.

It provides the cell with both structural support and protection, and also acts as a filtering mechanism. ... The primary cell wall of land plants is composed of the polysaccharides cellulose, hemicelluloses and pectin. Often, other polymers such as lignin, suberin or cutin are anchored to or embedded in plant cell walls.

Answer 2

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1]

Unicellular organism :

a) Organism is made up of single cell

b) The single cell performs all life processes like obtaining food , excretion , growth and reproduction.

Example : Amoeba , paramoecium , Chlamydomanas

Multicellular organism :

a) Organism is made up of many cells

b) Tissue differntiation and division of labour is observed.

Example : Plants , Animals , Fungi.

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2] Cell wall is present over the cell membrane in plant cells. It provides structural support and protection. It prevents over expansion when water enters the cell and prevents the cell from bursting . Hence , Cell wall is essential in plants