Question

Which of the following is not a feature shown by sponges?

• A. Sponges lack tissues and body symmetry.
• B. Sponges belong to phylum Porifera.
• C. Sponges are mainly found in marine habitats, but some may also be found in freshwater bodies.
• D. Swimming is possible for the sponge larvae as they have cilia.

Answer 1

The correct option is D

Swimming is possible for the sponge larvae as they have cilia.

The correct option is D.

The explanation for the correct option:

1. Sponges are the invertebrates, i.e. they do not possess body compositions like vertebrae and cranium.
2. The adults of the species are sessile, i.e. found attached to a substratum via a holdfast.
3. However, the larvae of sponges possess the tendency to swim with the help of unique cells found within it exhibiting little flagella.
4. These flagella move constantly and keep the water circulating within the sponge.

The explanation for the incorrect options:

Option A:

Sponges are the invertebrates, which are devoid of any tissues and body symmetry.

Option B:

Sponges are the invertebrates, which are placed under the phylum Porifera.

Option C:

The majority of the sponges are found in marine habitats, however, some of the sponges belonging to the family Spongillidae are found in freshwater.

Final answer: The sponge larvae can swim with the help of cilia is not a feature shown by sponges.