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Assertion (A): Platyhelminthes possess protonephridia for excretory functions.
Reason (R): Protonephridia are tubular excretory structures found in Platyhelminthes that help regulate water and ion balance.
Both A and R are true and R is the correct explanation of A.
Both A and R are true but R is NOT the correct explanation of A.
A is true but R is false.
A is false but R is true
Answers (1)
Assertion A states that Platyhelminthes possess protonephridia for excretory functions. This assertion is true. Platyhelminthes do possess protonephridia, which are tubular excretory structures involved in osmoregulation and the removal of metabolic waste products.
Reason R states that protonephridia are tubular excretory structures found in Platyhelminthes that help regulate water and ion balance. This reason is incorrect. While protonephridia do play a role in excretion, they are not directly involved in regulating water and ion balance. Platyhelminthes primarily use flame cells within the protonephridia to remove waste and excess fluids, but they rely on other mechanisms, such as diffusion, for osmoregulation.
Therefore, while assertion A is true, reason R is false. Hence, Option 3) is the correct answer.
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