3. Enumerate the general characteristics of hemichordate.
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Explanation:
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.
Body is divided into three regions – Proboscis, Collar and Trunk.
Circulatory system in open type.
Respiration occurs through gills.
The proboscis has a glomerulus, which is the excretory organ.
A primitive nervous system is present.
Sexes are separate or united.
Reproduction is mostly sexual reproduction.
Fertilization is external.
Development is mostly indirect. But a few species exhibit direct development.
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