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)

  1. Class 10
  2. Chapter 6 Class 10 - Life Processes (Term 1)

About the Author

CA Maninder Singh's photo - Founder at Teachoo
CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo