Question

Characteristics of porifera ??

Answer 1

porifera is a phylum come under kingdom animalia.

it includes generally marine organisms which are asymmetrical

Answer 2

Answer :

Porifera -

• They are commonly called sponges.
• They are generally marine.
• They are asymmetrical.
• They are primitive multicellular animal.
• They have cellular level of organisation.
• They have a water transport or canal system.
• Water enters through minute pose called ostia in the body.
• The water then enters the central cavity which is called spongocoel.
• And then water exits from the body through osculum.
• The pathway of water transport is helpful in food gathering and as well as for respiratory exchange.
• The same pathway is used for removal of waste.
• Choanocytes aur collar cells are lined up in the spongocoel and the canals.
• The digestion is intracellular.
• The body is supported by a skeleton which is made up of spicules or spongin fibres.
• They are hermaphrodite.
• They reproduce asexually by fragmentation and sexually by formation of gametes.
• The process of fertilization is internal and the development of the zygote is indirect having a larval stage which is morphologically different from the adult stage.
• Ex : Sycon, Spongilla, etc.