Q.

Contractile vacuole:

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a

Helps in respiration

b

Is formed by engulfing food particles

c

Is important for osmoregulation and excretion

d

Lacks true membrane

answer is C.

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Detailed Solution

The contractile vacuole is important for osmoregulation and excretion. It is found in Amoeba. In many cells, as in protists, food vacuoles are formed by engulfing the food particles. Gas vacuoles found inn prokaryotes lack true membrane.
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