Protoplasm is a colorless gel-like substance containing

• A. water, salt and nutrients
• B. water and fats
• C. air and nutrients
• D. enzymes

Answer: (A)

Protoplasm is the living, jelly-like material inside cells where all cellular activities happen. Its main constituents are water, dissolved salts (electrolytes), and nutrients that fuel metabolism. Water provides the solvent for biochemical reactions and the medium in which molecules move. Salts help maintain osmotic balance and enable enzyme functions. Nutrients supply the raw materials and energy the cell needs to grow and operate. Fats, air, or enzymes may be present, but they aren’t the primary components described for protoplasm. That’s why water, salt, and nutrients best describe its core makeup.