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: A
Solution :
The life cycle of fresh water mussel, including a parasitic glochidium larva on a fish host has many advantages. Besides affording protection and a means of nourishment, it ensures a far wide and more rapid dispersal of the species. A fish may carry these tiny parasites to great distances before they drop off. Considering the sluggish habits and poor locomotory ability of the mussels, this is probably the only way to ensure their proper distribution.
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