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Question
A nematocyst having a long and unarmed thread open at the tip without anus is
A nematocyst having a long and unarmed thread open at the tip without anus is
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Solution
The correct option is C Atrichous isorhiza
A nematocyst is a specialized organelle of a mature nematocyte. Holotrichous and Atrichous isorhiza are two such types.
The Atrichous isorhizas are oval and elongate and discharge a straight and unarmed thread tube which opens at the tip. The butt is absent.
While, Holotrichous isorhizas are oval or cylindrical. The thread tube is long with a narrow butt and forms three of four transverse coils. It bears a spiral row of small spines and may coil upon discharge.
Therefore, the correct answer is option A.
A nematocyst is a specialized organelle of a mature nematocyte. Holotrichous and Atrichous isorhiza are two such types.
The Atrichous isorhizas are oval and elongate and discharge a straight and unarmed thread tube which opens at the tip. The butt is absent.
While, Holotrichous isorhizas are oval or cylindrical. The thread tube is long with a narrow butt and forms three of four transverse coils. It bears a spiral row of small spines and may coil upon discharge.
Therefore, the correct answer is option A.
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