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.

 

Note: Students of this type cause outright hatred. Yes, the absence of brains is not uncommon, but if a fair amount of indifference is added to this – such a student can bring the teacher to a quiet frenzy. Typically, teachers during the semester of these students do not particularly pull, but during the session break away in full. And the big anger is not the first, but the second component of the type. Stupid but diligent, teachers are sorry, stupid and stubborn begin to even quietly respect. The type of student who knows everything, and is much better than the teacher. At lectures, he sits with a boredom, only if he can argue and flaunt his tremendous erudition. As a rule, I read a lot of smart books, I remember a lot of things, but I did not understand anything really. To explain to him this is useless – in response he will try to flash a suitable, in his opinion, quote and will shine from the consciousness of the victory, in his opinion, won. He goes to all lectures, and this is the very case when such teacher’s diligence only upsets. Which ends with the “execution”, as a rule, public, during the regular session.

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