Q.

Which of the following nature can be observed in the Phylum - Porifera?

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a

 Sessile
 

b

Free-living
 

c

Can be sessile or free living
 

d

None of the above

answer is A.

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Detailed Solution

Concept: Common name of Porifera is Sponges. Sponges have simpler body organisation.
They always stick to the surface or attach to the substratum.
All sponges are sessile, they are not free living organisms.
Hence, option A is the correct answer.
 

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