Hydra

Phylum :coelenterata /cnidaria

Class :hydrazoa

Characteristics of cnidarians : radial symmetry and tentacles with stinging cells.

example here :hydra

habitat : clear water,ponds.

Cells : form tissues .cnidocytes : used for defense and capturing prey,with nematocyst in it which has barbs and releases poison to the prey.interstitial cell :gives rise to new cells.

feeding : once prey is captured,is ingested by tentacles into its mouth for digestion in enteron (extracellular digestion) ,undigested food exit through mouth.nerve cells are present too.

reproduction : asexual and sexual. asexual :budding when condition favourable+regenaration .sexual : monoecious with sperm swim towards the ovary for fertilisation.

difference from sponges :One such feature is the presence of a gastrula stage during embryonic development, it has tissues .