Question

Animal possess nerve networks or nervous system to respond to their environment. But the single-celled Amoeba does not possesses any nerve cell, so, how it come to know whether a particle it encounters is a grain of sand and not its dinner by?

• A. Chemotaxis
• B. Skin
• C. Hormones
• D. All of these

Answer 1

The correct option is A

Chemotaxis

The correct option is A:

Explanation of the correct option:

1. Amoeba is a unicellular (single-celled) organism that uses chemotaxis, which is a type of chemical response mechanism to detect food particles nearby.
2. Chemotaxis helps Amoeba to differentiate a food particle from a sand grain through a chemical gradient.

Explanation of the incorrect options:

Option B:

Skin is a type of sense organ and Amoeba lacks sense organs.

Option C:

Hormones are chemical messengers produced by multicellular organisms only and Amoeba is a unicellular organism.

Option D:

Options B and C are incorrect. Therefore, option D is incorrect.

Final answer: Chemotaxis helps Amoeba to differentiate a food particle from a grain of sand.