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Question

Which product is commonly formed during anaerobic respiration in animals?

This question was previously asked in
RRB Group D 2025 Question Paper (18-Aug-2026) (Shift 1)
The correct answer is

Lactic acid

During vigorous activity, muscle cells of animals run short of oxygen and break down glucose without oxygen (anaerobic respiration).

In muscle cells, glucose is first broken into pyruvate in the cytoplasm, and pyruvate is then converted into lactic acid, releasing a small amount of energy. The build-up of lactic acid causes muscle cramps.

Alcohol (ethanol) with carbon dioxide is the product of anaerobic respiration in yeast, not in animals; glucose is the starting material, and oxygen is neither used nor produced.

Hence, the answer is Lactic acid.

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