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Question

Growth zone of Hydra is

A
Diffused
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B
Near the foot
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C
Below hypostome
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D
In the middle
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Solution

The correct option is B Below hypostome
In Hydra, there is a region that exhibits tissue renewal. The tissue thus formed proceeds into the hypostome and tentacles. There occurs a ring of tentacles in hydra and just under this (sub-tentacular) the growth zone is present. The hypostome which is a mouth like an organ has a meristematic growth zone.
So the correct option is 'Below hypostome'

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