Question

Body having meshwork of cells internal cavities lined with food filtering flagellated cells are indirect development are characteristics of phylum

• A. Coelenterata
• B. Porifera
• C. Mollusca
• D. Protozoa

Answer 1

The correct option is B Porifera

A. Phylum Coelenterata consists of acoelomate, marine, sessile, aquatic and radially symmetrical animals.

B. Phylum Porifera comprises sponges which are aquatic, marine, sessile, radially symmetrical or asymmetrical animals. This phylum has characteristic feature of canal system. The perforation of body surface by numerous apertures for the ingress and egress of water current, collectively forms the canal system. Sponges have a central body cavity known as spongocoel which is lined by specialised flagellated cells called choanocytes or collar cells.

C. Phylum Mollusca is the second largest phylum of animal kingdom and comprises of animals having hard shells.

D. Phylum Protozoa consists of acellular animals whose body is not divisible into cells.

Hence, the given characteristics match those of phylum porifera.

So, the correct answer is 'Porifera'.