Question

Spongocoel is also known as-
(a) Paragastric cavity
(b) Gastrovascular cavity
(c) Water vascular cavity
(d) Coelenteron

Answer 1

Hint: It is the cavity near the stomach and is the sponge cavity or one of the sponge cavities through which the radial canals open and through the cloaca open externally.

Complete step by step answer:
Spongocoel is the sponges' large, central cavity. Via hundreds of tiny openings, water enters the spongocoel (Ostia) and exits through the larger opening (osculum). It is a paragastric cavity and has epithelial cells lining it. A spongocoel is a large, central sponge cavity. Via hundreds of tiny openings, water enters the spongocoel and leaves through the greater opening. The spongocoel may be a plain internal space of the sponge or a complexly branched inner structure, depending on the body plan of the sponge.

Additional information: A structure discovered in primitive animal phyla is the gastrovascular cavity. It is responsible for both food digestion and nutrient transport throughout the body. Only one opening to the environment is available for the cavity. Food goes in and the same opening drains waste, making it a two-way digestive tract.
The echinoderm water vascular system is basically a system of canals filled with fluid that run along each of the regions of the body and have several external projections called tube feet. The machine has many features, one of which is to use water pressure to mediate movement and aid with feeding.
Coelenteron (enteron) In the gastrovascular cavity of Cnidaria and Ctenophora, the mouth has a single opening. It discharges eggs and sperm into certain classes. The coelenteron can be isolated by mesenteries or can form a system of canals.
So, the correct answer is ‘paragastric cavity’.

Note: Water is pumped directly into the spongocoel through pores, called Ostia, and then through an opening called the osculum (plural oscula) out of the sponge. Specialized digestive cells called choanocytes that philtre and take in food are lined with spongocoel. A more complicated body plan is the Syconoid.