Write a Short Note on Hydra

Short Note on Hydra

 

It belongs to phylum Coelenterata.

 

Habitat:

 

It is a fresh water animal and found in pond, stream etc.

 

M:

 

It is 6-10 mm long in squeezed shape. In elongate shape it is 20-30 cm.

 

Structure:

 

  1. i) Mouth is surrounded by many tentacles.

 

  1. ii) Tentacles have many stinging cells which acts as organ of offence and defense.

 

iii) Tentacles capture prey and stinging cells push it in mouth.

 

  1. iv) Un-digested food is also egested by mouth.

 

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