Question

Choose the correct statement with respect to unicellular organisms.

• A. In unicellular organisms, tissues work in co-ordination to perform different functions.
• B. Unicellular organisms do not require food.
• C. Unicellular organisms respire and reproduce.
• D. All unicellular organisms move by cilia.

Answer 1

The correct option is C

Unicellular organisms respire and reproduce.

The correct option is C.

Explanation of the correct option:

1. Respiration and reproduction are essential life process which is performed by all living organism.
2. Unicellular organisms perform respiration by diffusion as they do not have any respiratory structure.
3. They reproduce by budding, binary fission, and Amoeba reproduces by encysting in unfavorable conditions.

Explanation of the incorrect options:

Option A:

1. Unicellular organism is made up of one cell and tissue formation require many cells.
2. So unicellular organism does not contain any tissue and a single cell perform all the activities like nutrition, respiration, reproduction, and excretion.

Option B:

Every living organism requires food for its basic metabolism and energy production to carry out its function.

Option D:

A unicellular organism can move also by pseudopodia as in Amoeba, and flagella in bacteria.

Final answer: Unicellular organisms respire and reproduce.