Question

Bath sponge' is common name of
a. Spongilla
b. Euspongia
c. Euplectella
d. Leucosolenia

Answer 1

Hint: Sponges belong to the phylum Porifera, this is a multicellular organism, where the body is porous and contains the channels for the circulation of water through it, and it contains the mesohyl which is a jelly-like substance present or sandwiched between two layers of cells.

Complete answer:
> General features
- Sponges generally have unspecialized cells where they can be transformed into other types of cells.
- The newly formed cell that may migrate between the main cell layers and also within the mesohyl.
- Sponges actually do not have any particular organic systems such as nervous, digestive or circulatory systems.
- Sponges have constant water flow in their bodies in order to obtain food and oxygen and also to remove wastes from the body.
- Sponges have a unique feeding system where their body, instead of having a mouth, they have tiny pores called Ostia, through which water is drawn, whereas cells in the sponge walls filter the food present in the water, as the water is pumped out of the body through the osculum.

Classification of sponges
Sponges are classified into 3 types. They are
Calcareous sponges - Calcarea
Glass sponge - Hexactinellida
Desmos sponge - Demospongiae

Most of the commercially used sponges belong to Desmospongiae, whereas bath sponge also belongs to demospongiae , and it is called as euspongia, it is mainly found in the Mediterranean sea.

Hence, the correct answer is option (B).

Note: This euspongia or bath sponge is an hemraphrodite, and it can reproduce sexually and asexually, and the budding is the asexual type of reproduction found in this sponges. As the sponges are soft in nature, mostly they are used commercially as scrubbers.