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Question

Contractile structure of nematoblast is

A
Lasso
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B
Cnidocil
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C
Tube
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D
Refractive rods
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Solution

The correct option is A Lasso
Nematoblasts have capsules containing stinging thread-like structure that are usually barbed. These structures are called Lasso and are used as a defense mechanism upon incoming danger and can paralyze upon action.
So, the correct option is, 'Lasso'

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