Which of the following options correctly describes sponges?

Moderate

A

They are aquatic, mostly marine, sessile or free-swimming, radially symmetrical animals.
B

They are generally marine and mostly asymmetrical animals with cellular level of organisation.
C

They are exclusively marine, radially symmetrical, diploblastic organisms with tissue level of organisation.
D

They are dorso-ventrally flattened mostly endoparasites found in animals including human beings.

Solution

Sponges are generally marine and mostly asymmetrical animals with cellular level of organisation. Some (e.g., Spongilla) inhabit freshwater.
Cnidarians are aquatic, mostly marine, sessile or free-swimming, radially symmetrical animals. All sponges are sessile.
Ctenophores are exclusively marine, radially symmetrical, diploblastic organisms with tissue level of organisation. Sponges exhibit cellular level of organisation and some of them are freshwater forms.
Platyhelminthes are dorso-ventrally flattened mostly endoparasites found in animals including human beings.

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