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Q.

Which of the following has a central gastro-vascular cavity with a single opening, mouth on hypostome?

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a

Hydra

b

Scypha

c

Locusta

d

Taenia

answer is A.

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Detailed Solution

Hydra (a cnidarian) has a central gastro-vascular cavity with a single opening, mouth on hypostome. Scypha has a spongocoel which opens out by an osculum. Taenia lacks a body cavity and a mouth. Locusta is an insect. Its body cavity is haemocoel. Its alimentary canal has two openings – mouth and anus.

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Which of the following has a central gastro-vascular cavity with a single opening, mouth on hypostome?