Carmine particle put above osculum of a sponge would be

Left there

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Ingested and digested

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Thrown away

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Ingested and thrown away by ostia

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Solution

The correct option is C Thrown away
Water enters the sponges through dermal ostia and then water enters the body cavity or osculum and leaves through osculum. Hence osculum is comparable to cloaca of higher animals. Any object placed near osculum will be pushed or thrown away. Thus if carmine particles are placed close to osculum of a living sponge, these will be carried away.

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