A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
E) If the assertion is false but reason is true
Correct Answer: A
Solution :
A few sponges may kill other sessile animals by growing over them and cutting off their food and oxygen supply. Boring sponges such as Cliona, attach themselves to shell of oyster, barnacles etc, boring them so full of holes that their contained animals are destroyed, and in time the shells are entirely broken up. Some times boring sponges may prove great nuisance to oyster beds. Some sponges poisonous secretions or give off strong unpleasant odours or sting with sharp spicules. Certain species may prove as dangerous as the poisonous ivy, when touched by man.
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