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 :
In Nereis, most of the posterior segment filled with gametes, constitute the sexual region or epitoke of worm. Few anterior segment do not take part in gamete formation, constitute the asexual region or atoke. Sexually mature worm, with these two regions known as heteronereis and the phenomenon involving transformation of non-sexual individual into sexual individual is referred to as epitoky.
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