Question

Which of the following is responsible for excretion in Protozoa?

• A. Simple diffusion
• B. Nephridia
• C. Malphigian tubules
• D. Flame cells
• E. Nephrons

Answer 1

Answer: (A)

Simple diffusion

1. Simple diffusion is the excretory mechanism for unicellular organisms like protozoa. This process is associated with osmoregulation of cells.

2. Nephridia is the structure responsible for excretion in invertebrates. they primarily found in land-based invertebrates like an earthworm, etc.

3. Malphigian tubules in a similar way are excretory structures found in arthropods.

4. Flame cells are specialized structures found only in freshwater invertebrates.

5. Nephrons are the microscopic unit of Kidney found in mammals including humans.

Hence, the correct answer is 'Simple diffusion'.