Assertion (A): Humans are not truly aerobic.  

Reason (R): They produce lactic acid anaerobically.  



  • Humans are aerobically respiring  animals
  • Sometimes anaerobic respiration takes place in tissues like skeletal muscles ,  when their oxygen needs are not being met.


Therefore, the muscles respire anaerobically and produce lactic acid from glucose, but ONLY when oxygen is lacking.



  • The assertion is True
  • The reason is True

The reason is the correct explanation of the assertion

Respiration in humans-01.jpg

So, the correct option is (b)

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo