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. Unicellular creatures breathe either aerobically or anaerobically. They have no respiratory structures and cannot breathe. They breathe through diffusion through the skin's surface.
2. Binary fission is used to generate unicellular organisms. In this case, a single cell splits into two daughter cells. This is observed in bacteria and amoeba.
3. The yeast cells proliferate by a process known as budding.
4. Amoeba can reproduce through a process known as encysting. It produces a protective shell around itself called a cyst when exposed to harsh circumstances. This cyst includes chitin, which aids in reproduction.

Explanation of the incorrect option:

Option A:

In unicellular organisms, they have only one cell. hence there is no tissue function.

Option B:

Unicellular organisms are living organisms and hence they would require food to carry out their functions.

Option D:

Unicellular organisms have different types of locomotory structures in their body like flagella, cilia, pseudopodia, and tentacles.

Final answer: The correct statement for unicellular organisms is they respire and reproduce.