Identify the given figures A,B and C and select the correct option.

a. A- Sycon, B Euspongia, C-Spongilla
b. A- Euspongia, B spongilla, C- Sycon
c. A - Spongilla, B - Sycon, C – Euspongia
d. A - Euspongia, B Sycon, C- Spongilla

Hint: Sponges are the members of the phylum Porifera, the body of sponges is porous and made of tubular channels, which useful for the water to circulate and it also contains the jelly-like substance called Mesohyl is present in the sponges.

Complete answer:
> Sycon: It is a genus of the calcareous sponge, where these sponges are small, which grow up to 7.5 centimeters, and the length of this sponges are range from 2.5 centimeters to 7.5 cms, these are tube-shaped sponges which are white to cream in color, the sycon sponges are also called as Q TIP Sponges, and they are also called as an aquarium hobbyist, and they are frequent hitchhikers brought in to the water.

> Euspongia:
Euspongia or also called spongia, these are the genus of the marine sponges, these types of sponges almost contain 60 species, Some species of euspongia are used as a cleaning tool, but later they have been replaced by the synthetic parts of the plant.

> Spongilla:
When coming to the spongilla, it belongs to the family spongillidae, they are the freshwater sponges, and they usually found in the lakes, and slow water streams, and this sponges are floating in the water, and they also attached to the rocks and lags and filter the water from various aquatic organisms such as protozoans etc.

Hence, the correct answer is option (A), a) sycon, b) euspongia, C) spongilla.

Note: Most of the body of the sponge is hollow, while it only contains the mesohyl which is present at the middle to withstand the shape, the adult and matured sponges are sessile, while they are of two types, marine and freshwater sponges, some of them may move at the speed of 1 to 4mm per day.