Question 33 - MCQs from NCERT Exemplar - Chapter 6 Class 10 - Life Processes

Last updated at July 14, 2026 by

Lack of oxygen in muscles often leads to cramps among cricketers.

This results due to

(A) conversion of pyruvate to ethanol

(B) conversion of pyruvate to glucose

(C) non conversion of glucose to pyruvate

(D) conversion of pyruvate to lactic acid

 

Answer.:

  • During vigorous physical exercise , oxygen gets used up faster in the muscle cells than can be supplied by the blood. 
  • Thus muscle cells (in humans as well as animals) obtain energy from anaerobic respiration .
  • Due to lack of oxygen in the muscles, pyruvate is anaerobically broken down into lactic acid.
  • The accumulation of lactic acid causes muscle cramps.

Anaerobic Respiration reaction-01.jpg

So, the correct answer is (d) 

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