Question

Pore bearing animal belongs to which phylla

Answer 1

Hint: Pore bearing animals are the simplest form of animals that contain pores throughout the body with one large opening. These animals are found in seas and oceans with very few in freshwater too.

Complete answer:
Porifera is the phylum that includes the animals with spores on the body. The animals that contain spores on the body are sponges. They are the simplest form of animals.

Members of this phylum are sponges. Sponges are animals that bear pores on the body. They are generally marine and mostly asymmetrical animals. They are multi-cellular animals and have a cellular level of organisation.

Sponges have a water transport or canal system. Water enters through the minute pore (ostia) in the body wall into a central cavity, spongocoel, from where it goes out through the osculum. The water transport system present in sponges is helpful in food gathering, exchange of gases and removal of water. Choanocytes or collar cells are present which have an excretory function.

Some unique features of sponges are enlisted below:
- Digestion in these animals is generally intracellular.
- The body is made up of a skeleton consisting of spicules or spongin fibres.
- Sexes in these organisms are generally not separate,i.e., eggs and sperms are produced by the same individual.
- In sponges, asexual reproduction takes place by fragmentation and sexual reproduction by gamete formation.
- Fertilisation is internal. Indirect development with a larval stage is morphologically different from the adult.

Note: Sponges have three different types of body which are asconoid, leuconoid and syconoid. They are a basal metazoa clade and are sisters of the diploblastic. They are multicellular that contain pores all over the body which are channels for circulation of water consisting of jelly-like mesophyll which is generally sandwiched in between the two thin layers of the cell.