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: B
Solution :
From the sea, the lampreys return to rivers only once for spawning (the method of copulation in fish). On return to the rivers they stop feeding and start building nests of small stones in river beds. Eggs are squeezed out through the cloaca into the nest and sperms are deposited on them, fertilization in external. They lose their reproductive capacity after spawning. And the presents die simultaneously.
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