Question

In case of poriferans, the spongocoel is lined with flagellated cells called as
A) Mesenchymal cells
B) Ostia
C) Oscula
D) Choanocytes

Answer 1

Hint: The plant cells have a flagella with protoplasm that is also called neck cells and they occasionally made a thin coating. Spongocoel is a huge, essential cavity of sponges from where water enters.

Complete answer:
Let’s first need to know about these cells.
A. Mesenchymal cells are stem cells that can make several varieties of cells belonging to our skeletal tissues, such as cartilage, bone and fat.
B. The pores present on the bodies of the sponges are known as Ostia. The Ostia leads to the interior of the body of the sponges through the mesophyll layer.
C. Oscula is related with phylum porifera which is an exclusive classification of aquatic animals. It goes to the animal kingdom with a sponge-like structure.
D. The spongocoel is surrounded by a lining of cells called choanocytes, containing a central flagellum that is surrounded by microvilli. The body of the spongocoel is creased by choanocytes taking flagellum which helps in pushing water from the spongocoel. It varies in its simplicity and complexity depending upon its body plant which can be Syconoid and leuconoid. According to the body plan, spongocoel has a various lining, they are: on the surface of the spongocoel, radial canals in syconoid sponges, and chambers like in leuconoid sponges.

So, the correct answer is option (D) Choanocytes.

Note:
Sponges are related to the phylum porifera which means pores tool. It is organized from the Greek word defined sponges. The organisms lack true tissues and organs.