Question

Assertion (A) Protonephridia or Flame cells in flatworms help in osmoregulation.
Reason (R) These are excretory organs.

• A. If both A and R are true and R is the correct explanation of A.
• B. If both A and R are true, but R is not the correct explanation of A.
• C. If A is true, but R is false.
• D. If A is false, but R is true

Answer 1

Answer: (B)

Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
Protonephridia or Flame cells are the excretory structures in Platyhelminthes (flatworms, e.g. Planaria). These are also concerned with ionic and fluid volume regulation, i.e. osmoregulation in these animals.