Question

Porifera are

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

Answer 1

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.