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Question
Which of the following groups does hydra belong to?
Which of the following groups does hydra belong to?
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Solution
The correct option is B Cnidaria
The hydra belongs to the group Cnidaria. They have no vertebral column and are diploblastic.
The identifying characters of a hydra are,
i) It is aquatic and seen in the freshwater.
ii) It has a microscopic body which is composed of two layers - ectoderm and endoderm which is separated by a non-cellular mesoglea.
iii) There are many tentacles surrounding the mouth, no anus, mouth acts for both ingestion and egestion.
iv) The body cavity is a single coelenteron.
v) An adhesive pedal disc is present, body with cnidoblast cells.
Cnidaria
The hydra belongs to the group Cnidaria. They have no vertebral column and are diploblastic.
The identifying characters of a hydra are,
i) It is aquatic and seen in the freshwater.
ii) It has a microscopic body which is composed of two layers - ectoderm and endoderm which is separated by a non-cellular mesoglea.
iii) There are many tentacles surrounding the mouth, no anus, mouth acts for both ingestion and egestion.
iv) The body cavity is a single coelenteron.
v) An adhesive pedal disc is present, body with cnidoblast cells.
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