Question

'Bath sponge' is the common name of
(a) Spongilla
(b) Euspongia
(c) Leucosolenia
(d) Sycon

Answer 1

Hint: Sponges are multicellular animals which are primitive of all life forms, it consists of sponges types of organisms. The bath sponge is a common sea sponge that is found throughout the Mediterranean Sea.

Complete answer:
Euspongia is commonly known as a bath sponge. It belongs to the class Demospongiae under the Phylum Porifera of Animal kingdom. It is a hermaphroditic animal. It can reproduce asexually employing budding or fragmentation or through sexual reproduction. Individuals are generally dioecious whereas sometimes sequential hermaphrodites. The free-swimming larvae are lecithotrophic and development takes place after attaching to a benthic surface. Euspongia is known as the bath sponge because of its texture consisting of woolly, sponge-like fibres, something like the sponges used for scrubbing while taking bath. Hence euspongia are known as bath sponges.
-Sponges are primitive multicellular animals. They have a cellular level of an organization therefore they do not form tissue or organs inside their body. The cell of their body coordinates to perform several body functions.
-They are mostly marine and asymmetrical. They are known for their well-developed water canal system. The common examples of sponges include Euspongia, leucopenia, Euplectella, Cliona, etc.
-Their body is supported by a skeleton made of calcareous or siliceous spicules and spongin fibre. Different cells are found in sponges; namely pinacocytes, choanocytes, and amoebocytes. Pinacocytes form the protective layer of the body. Choanocytes maintain water current inside the body. Amoebocytes store reserve food.

So, the correct answer is 'Euspongia'.

Note:
-Sponges are believed to be evolved from flagellated protozoans. They are hermaphrodites with males and females in the same individual.
-They reproduce sexually and asexually. Asexual reproduction involves fragmentation, budding, and regeneration. -Sexual reproduction involves internal fertilization and indirect development.