Question

This question consists of two statements, Assertion and Reason.

While answering this question you are required to choose any one of the following five responses.

Assertion: Sponges belong to Porifera.

Reason: Sponges have canal system.

• A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
• B. If the assertion is false but the reason is true.
• C. If both assertion and reason are false.
• D. If assertion is true but reason is false.
• E. If both assertion and reason are true but reason is not the correct explanation of the assertion.

Answer 1

The correct option is E If both assertion and reason are true but reason is not the correct explanation of the assertion.

Assertion-Reason relation

Organisms belonging to the phylum Porifera are commonly called sponges and they live usually in marine habitats. The characteristic presence of lots of pores throughout their body is the reason behind them being called as poriferans (pore-bearing). Hence the assertion is true.

There is a water canal system which starts from ostia and ends at the osculum. This facilitates gathering enough nutrients, removal of waste products and exchange of respiratory gases using the surrounding water. Hence the given reason is true but it does not justify the assertion.

Final answer

(B) If both assertion and reason are true but reason is not the correct explanation of the assertion.