Question

write about phylum porifera and phylum ctenophora​

Answer 1

Answer:

Phylum - Porifera

Members of this phylum are commonly known as sponges. They are generally marine and mostly asymmetrical animals. These are primitive multicellular animals and have cellular level of organization. Sponges have a water transport or canal system. Water enters through minute pores in the body wall into a central cavity, spongocoel, from where it goes out through the osculum. This pathway of water transport is helpful in food gathering, respiratory exchange and removal of waste. Choanocyteor or collar cells line the spongocoel and the canals. Digestion is intracellular. The body is supported by a skeleton made up of spicule fibers. Sexes are not separate i.e. egg and sperms are produced by the same individual. Sponges reproduce asexually by fragmentation and sexually by formation of gametes. Fertilization is internal and development is indirect having a larval stage which is morphologically distinct from the adult.

Example : Sycon, Spongilla and Euspongia.

Phylum - Ctenophora

Ctenophores, commmonly known as sea walnuts or comb jellies are exclusively marine, radially symmetrical,diploblastic organisms with tissue level of organisation.The body bears eight external rows of cilliated comb plates, which help in locomotion.Digestion is both extracellular and intracellular.Bioluminescene is well marked in ctenophores.Sexes are not separate.Reproduction takes place only by sexual means.Fertilisation is external with indirect development.

Example : Pleurobrachia and Ctenoplana.

Answer 2

_______꧁αиѕωєя꧂________

phчlum - pσrífєrα

• thєч αrє αlѕσ knσwn αѕ ѕpσngєѕ.
• thєч αrє fσund ín mαrínє wαtєr.
• thєч αrє mσѕtєllч αѕѕчmєtrícαl αnímαlѕ.
• thєч hαvє cєllulαr lєvєl σf σrgαníѕαtíσn
• wαtєr єntєrѕ tσ thєrє вσdч thrσugh σѕtíα.
• ít gσєѕ σut thrσugh σѕculum.
• ѕpσngєѕ rєprσducє αѕєхuαllч вч frєgmαntαtíσn αnd ѕєхuαllч вч fσrmαtíσn σf gαmєtєѕ.
• dєvєlσpmєnt íѕ índírєct.
• єхαmplєѕ:- ѕчcσn,ѕpσngíllα αnd єuѕpσngíα.