Question

In Cnidarians, digestion occurs in the gastro-vascular cavity and then inside endodermal cells. In sponges, digestion takes place in

• A. Paragastric cavity and choanocytes
• B. Spongocoel and Food vacuoles
• C. Choanocytes and Amoebocytes
• D. Spongocoel and Amoebocytes

Answer 1

The correct option is A Paragastric cavity and choanocytes

The digestion in sponges is intracellular. It takes place in coenocytic oral cells. The movement of water initiated by the coenocyteS. It helps in the digestion and respiratory system of sponges because along with the water they also transport oxygen. They then push out carbon dioxide which is a waste material out of the sponge body.

Choanocytes make up the third layer in sponges. The first layer gives sponges pores and the second layer gives the shape. The mobile layer which is also known as amebocyte work in concent with choanocytes to feed sponges.

So, the correct option is 'Paragastric cavity and choanocytes'