Question

Choose the option(s) correct for unicellular organisms.

• A. They consist of a cluster of cells.
• B. Single cell performs all the functions in the body.
• C. They consist only of a single cell.
• D. Snail is an example for a unicellular organism.

Answer 1

Answer: (B), (C)

The correct options are
B Single cell performs all the functions in the body.
C They consist only of a single cell.

A unicellular organism is an organism which consist of only one cell.

• Unicellular organism consists of a single cell. So all the vital functions like nutrition, digestion, excretion, reproduction, etc., are carried out by that single cell. E.g., amoeba.
• Multicellular organisms consists of clusters of cells. Here all the cells carry out various specialised functions. E.g., bear, deer, snail, human, etc.