In which of the following organisms, extracellular as well as intracellular digestion occurs?

Paramecium

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Planaria

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Earthworm

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All the given options

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Solution

The correct option is B Planaria
In Planaria, digestion involves both the modes, ie, extracellular as well as intracellular. Fats are normally digested extracellularly, while other food components are digested intracellularly.
The intracellular digestion is done by amoeboid cells lining the intestine. Digested food diffuses to the surrounding mesenchyme.
Thus the correct answer is option B.

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