A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
E) If the assertion is false but reason is true
Correct Answer: C
Solution :
One of the most important characteristics of protozoa is the possession of contractile vacuoles. The main function of contractile vacuole is in osmoregulation. The excess water of protozoan body is got rid off by means of contractile vacuole which contract and expand at regular intervals. As these help in passing exces water, the excretory products of their body get dissolved and eliminated with the fluid of contractile vacuoles. Numerous non contractile food vacuoles help in digestion.
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