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Question

Porifera are

A
Generally marine but few are found in fresh water
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B
Generally found in fresh water but few are marine
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C
All are marine
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D
All are found in fresh water
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Solution

The correct option is A Generally marine but few are found in fresh water
Poriferans are multicellular organisms, which are sedentary in nature. They have a cellular level of organisation. Most of them are marine, while a few are fresh water forms as well. For example, fresh water sponge is Spongilla and a marine sponge is Leuconia. Thus, the correct answer is option A.

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