Assertion (A): In the human heart, there is no mixing  of oxygenated and deoxygenated blood.  

Reason (R): Valves are present in the heart which  allows the movement of blood in one direction  only.  



  • The human heart has 4 different chambers which prevent mixing of oxygenated and deoxygenated blood due to the partition between two sides called septum
  • Valves are present in the heart to prevent backflow of blood i.e., to allow the movement of blood in one direction only.  


  • The assertion is True
  • The reason is True
  • But the reason is not the correct explanation for the assertion.


So, the correct answer 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