Salient features of phylum porifera
Answers
(1) All the sponges are Aquatic, Sedentary, Asymmetrical or Radially, First multicellular organisms and have cellular grade of organization.
(2) They are diploblastic. Ectoderm is formed by pinacocyte and endoderm is formed by choanocyte. Both layers are called pinacoderm and choandoderm.
(3) The body is perforated by numerous minute pores called ostia.
(4) The ostia open into a large cavity called spongocoel.
(5) The spongocoel opens to the outside by a large opening called osculum.
(6) The sponges possess an endoskeleton in the form of calcareous spicules.
(7) Excretion and respiration occur by diffusion.
(8) They have greater power of regeneration.
(9) Reproduction takes place by asexual or sexual methods.
(10) Development is indirect or direct. The common larval are parenchymula, amphiblastula, etc.
Features of phylum polifera
Explanation:
- Poriferans are regularly called wipes.
- These are multicellular life forms which are sessile/inactive in nature.
- The majority of them are marine while a couple are new water structures.
- Body is round and hollow, uneven or has spiral evenness.
- Body divider is diploblastic which comprises of an external layer called pinacoderm and an inward layer called choanoderm.
- The center layer is called mesenchyme which has different sorts of meandering amoebocytes.
- Body divider contains various pores called ostia through which water enters in the body through a channel framework into the focal body cavity, called spongocoel.