Main Characteristics of Phylum Porifera
These animals are called Porifera because animals of this group have small pores on their bodies. These are called sponges.
Habitat:
They are aquatic animals and mostly found in sea water. Some are also found in fresh water.
Structure:
- i) They are multicellular organisms.
- ii) The body is not organized into tissues or organs.
iii) They are found in different colours.
- iv) They take oxygen produced by water plants and give out carbon dioxide.
Locomotion:
They are sessile i.e. They cannot move and remain attached with stones.
Nutrition:
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Small canal are present in the body. Water passes through these canals and provides food and oxygen to body cells. Cells also excrete their wastes in this water.
Examples:
Their example in sea-water is sponge. And spongilla is in fresh water.
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