Protozoa need moisture to survive.

Protozoa need moisture to survive.

• A. Moisture
• B. Heat
• C. Oxygen
• D. Nutrients

Answer: (A)

Protozoa require moisture because they live in watery or damp environments where their cells stay hydrated and can function. A thin film of water enables diffusion of nutrients to the cell and wastes away from it, and supports movement with cilia, flagella, or pseudopods that need a wet medium to operate. Desiccation quickly disrupts membranes and metabolic processes, leading to death. While temperature, oxygen, and nutrients influence growth and viability, moisture is the fundamental environmental condition that allows these organisms to carry out the basic life processes, making it the best choice.

Protozoa require moisture because they live in watery or damp environments where their cells stay hydrated and can function. A thin film of water enables diffusion of nutrients to the cell and wastes away from it, and supports movement with cilia, flagella, or pseudopods that need a wet medium to operate. Desiccation quickly disrupts membranes and metabolic processes, leading to death. While temperature, oxygen, and nutrients influence growth and viability, moisture is the fundamental environmental condition that allows these organisms to carry out the basic life processes, making it the best choice.