EVERYDAY SCIENCE

Detailed explanation-1: -So, the correct answer is ‘Choanocyte’.

Detailed explanation-2: -The core gastric cavity of sponges is the spongocoel. The paragastric cavity of the sponges is often pointed to as the spongocoel. It is largely lined with flagella by choanocytes that are specialized digestion cells.

Detailed explanation-3: -Choanocytes or collar cells, line the inner surface of the spongocoel and the canal of sponges. These are flagellated cells.

Detailed explanation-4: -The morphology of the simplest sponges takes the shape of a cylinder with a large central cavity, the spongocoel, occupying the inside of the cylinder. Water can enter into the spongocoel from numerous pores in the body wall.

Detailed explanation-5: -Within the canals of the sponge, chambers are lined with specialized cells called choanocytes, or collar cells. The collar cells have a sticky, funnel shaped collar and a hairlike whip, called a flagellum.