Question

define phylum porifera charectersitcks in 5 points

Answer 1

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Answer 2

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Here is your answer..

Phylum Porifera 
1. These animals are with simplest body plan and are called as sponges. They bear numerous pores on their body. These pores are called as 'ostia' and 'oscula'.
2. These are aquatic animals and most of them are freshwater dwellers and marine.
3. Most of them have asymmetrical body.
4. These animals have special type of cells called as collar cells.
5. These animals are always attached to substratum hence they do not show locomotion and they are referred as sedentary animals.
6. Their spongy body is supported by spicules or spongin fibres. Spicules are made up of calcium carbonate or silica. 
7. These animals reproduce by budding by sexual or asexual method. Also, they have a good ability of regeneration.
Examples .. Sycon, Hyalonema.
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