write the general features of echinodermata and hemichordata
Answers
Explanation:
Characteristic Features of Phylum Echinodermata
These are exclusively marine animals.
The larval forms show bilateral symmetry and adult forms show radial symmetry.
They are triploblastic.
It exhibits organ system grade of organisation.
They have a true coelom.
The body is uniquely shaped.
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Answer:
Explanation:
Characteristic Features of Phylum Echinodermata
These are exclusively marine animals.
The larval forms show bilateral symmetry and adult forms show radial symmetry.
They are triploblastic.
It exhibits organ system grade of organisation.
They have a true coelom.
The body is uniquely shaped. It can star like, elongated or spherical.
The body is unsegmented without a head.
The body surface is covered with calcareous spicules.
Body cavity has the distinguishing water vascular system.
Tube feet help in locomotion.
The brain is absent but a nervous system is present with a nerve ring and radial nerve cords.
Respiration occurs through tube feet and gills.
Sense organs are poorly developed and include tactile organs, chemoreceptors, terminal tentacles etc.
Sexes are separate.
Fertilisation is external.
Lost parts can be regenerated.
Characteristic Features of Phylum Hemichordata
Hemichordata is bilaterally symmetrical and triploblastic animal.
They are exclusively marine animals.
They can be solitary or in colonies.
Hemichordata have a true body cavity or coelom.
The digestive tract is complete with an anus and can be in the form of a U shaped tube or straight.
A buccal diverticulum is present in the proboscis.