Write notes on Phylum Annelida.
Answers
Annelids.:
-Annelida means "little rings"
-Its body divided into segments seperated by septum ( septum=internal walls)
-some have bristles called setae on each segment.
-it has closed circulatory system.
-have well developed nervous system with brain and nerve cords
-sexual reproduction, some are hermaphrodites
Answer:
They have a long and segmented body.
Annelids are bilaterally symmetrical.
They are triploblastic.
Also, they exhibit organ system grade of organisation, showing organ differentiation.
The body is covered with a thin cuticle.
They are coelomate. A body cavity or coelom is present.
Annelids live in moist environments, moist soil, freshwater and marine water.
They have parapodia and chitinous setae, used for locomotion.
Their body appears red due to the presence of haemoglobin.
Excretory and nervous systems are present.
The digestive system is complete and developed.
Respiration happens through the general body surface.
These invertebrates have a true closed circulatory system.
Sexes may be separate or united, wherein they are called
hermaphrodites.
Fertilization can be internal or external.
Learn more about Phylum Aschelminthes here.
Examples of Annelids
Earthworm
Leeches
Lugworms