two characteristics of porifera
( make it in points ) 2 mks question
Answers
Answer:
Poriferans are commonly called sponges.
These are multicellular organisms which are sessile/sedentary in nature.
Most of them are marine while a few are fresh water forms.
Body is cylindrical, asymmetrical or has radial symmetry
Explanation:
1. The animals with simplest body plan are called sponges. They bear numerous pores on their body. Those pores are called Ostia and Oscula.
2. These are aquatic animals. Most of them are marine and few freshwater dwellers
3. Most of them have asymmetrical body.
4. These animals are always attached to substratum, hence do not show locomotion. Hence they are referred as sedentary animals.
5. Their spongy body is supported by spicules or spongin fibers. Spicules are made up of silica or calcium carbonate.
6These animals have special type of cells called collar cells.
7. These animals reproduce by budding or by sexual method. They have a good ability of regeneration.
example: Sycon, Euspongia,Hyalonema.
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