level 3

Question 1

four points about Porifera - phylum?

Answer 1

• member of phylum is commonly known as sponges.
• they’re marine and asymmetrical animals.
• have water transport/canal system.
  -water enters through Ostia, water goes out through the osculum. body wall into a central cavity spongocoel.
• pathway of water transport that is helpful in food gathering, respiratory exchange, and removal of waste.
  ex, sycon, spongilla, etc

Question 2

(phylum-porifera)

i) choanocytes
ii) spicules/spongin fibres
iii) hermaphrodite

Answer 2

i) or also called collar cells line the spongocoel and the canals. digestion is intercellular.
ii) the body is supported by a skeleton made up of spicules or spongin fibers
iii) sexes are not separated

Question 3

how do sponges reproduce asexually and sexually? how is fertilization happen? (phylum-Porifera)

Answer 3

asexually by fragmentation
sexually by the formation of gametes.
fertilization is internal, development is indirectly having a larval stage that is morphologically distinct from the adult.