Question

Assertion (A): Animals belonging to phylum Porifera are often called sponges.
​Reason (R): The animals have porous bodies.​

• A. Assertion(A) is false and reason(R) is true.​
• B. Both assertion(A) and reason(R) are true, but reason(R) is not the correct explanation for assertion.​
• C. Assertion(A) is true and reason(R) is false.​
• D. Both assertion(A) and reason(R) are true and reason(R) is the correct explanation for assertion(A). ​

Answer 1

The correct option is D Both assertion(A) and reason(R) are true and reason(R) is the correct explanation for assertion(A). ​

Correct option: (a)Both assertion(A) and reason(R) are true and reason(R) is the correct explanation for assertion(A). ​

$\bullet$ The animals belonging to phylum Porifera bear many pores on their body.​
$\bullet$ These pore-bearing organisms are also known as sponges.​
$\bullet$ Water enters through these minute pores (ostia) in the body wall into a central cavity, from where it goes out through the osculum.
$\bullet$ Water transport is helpful in food gathering, respiratory exchange and waste removal. ​
$\bullet$ Hence, the correct option is (a). ​