Question

A green sponge is
A. Spongia
B. Leucosolenia
C. Spongilla
D. Scypha (Sycon)

Answer 1

Hint:-The presence of thousands of pores in their body signifies the name sponge. The commonest sponges are Halichondria panicea called as Breadcrumb Sponge and Cliona celata called as Red Boring Sponge and Sycon ciliatum called a purse sponge. Spongia is one of the costliest Turkish bath sponge used commercially.

Complete answer:
A sponge is a member of the phylum Porifera. These are multicellular organisms that have bodies with numerous pores and channels allowing water to circulate through them.
Leucosolenia is a genus belonging to the calcareous sponges of the family Leucosolenia. Then have groups of curved vases appear, each ending in an osculum. Leucosolenia is a type of exclusively marine, sessile, radially symmetrical, and colonial sponge.
Spongilla is a genus belonging to freshwater sponges of the family Spongillidae. They attach to rocks and logs and filter the water for small aquatic organisms like protozoans, bacteria. It is green coloured due to the presence of symbiotic green alga in it. The outer surface will be soft textured and is supported by a skeleton of spicules, spongin fibers. Spicules may be simple, siliceous, or tetraxial. Sycon is a genus belonging to calcareous sponges of the family Cottidae. They are small and tube-shaped, and creamish white. They are often known at the aquarius as Pineapple sponges.
Thus, the right option is C.

Note:- The sponges with their common names are as follows:-
● Sycon - urn sponge or scypha or crown sponge.
● Euspongia - bath sponge
● Euplectella - venus flower basket
● Cliona - boring sponge, harmful to oysters.
● Leucosolenia - smallest sponge.
● Hyalonema -glass rope sponge