alleryStart learning →During vigorous exercise, the anaerobic breakdown of pyruvate in our muscles produces
Aethanol and CO₂
Bcarbon dioxide and water
Clactic acid
Donly water
Answer & Solution
Correct answer: C. lactic acid
1. When oxygen supply is short during heavy exercise, muscle cells respire anaerobically.
2. Pyruvate is converted into **lactic acid**, which causes muscle cramps.
3. In yeast, anaerobic respiration instead gives ethanol and CO₂.
_Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch6 'Life Processes', §6.3_
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