Nematocysts are activated by

MCQ

✓

Answer

Correct option: B.

Touch

b
(b)A mechanical stimulation of cnidocil by contact with an object is essential, but not sufficient, for discharge.

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$I.$ it contains human excreta and other organic waste

$II.$ it contains a number of pathogenic microbes

Which of the statement given above is/are correct?

Statement I: The PNS is divded into two divisions called sympathetic neural system and parasympathetic neural system.
Statement II: Visceral nervous system is the part of peripheral nervous system that comprises the whole complex of nerves, fibres, ganglia & plexuses.

$I$. Platyhelminthes $II$. Coelenterates $III$. Aschelminthes $IV$. Annelids $V$. Echinoderms

A drug used for ___$A$___ patients is obtained from a species of the organism ___$B$___ .

The one correct option for the two blanks is