A) Internal fertilization and reciprocal fertilization
B) Cross fertilization and reciprocalfertilization
C) Reciprocal fertilization and internal fertilization
D) External fertilization and internal fertilization
Correct Answer: B
Solution :
Earthworm is monoecious or hermaphrodite, ie, male and female reproductive structures develop in the same individual. They show reciprocal cross fertilization and mate in summer. Maturation of sperm occurs much more earlier than that of ova (protandrous). During copulation, two individual earthworms from adjacent burrows half emerge out and lie in contact in opposite direction with each other. In such a way that the male genital pores of one face the spermathecal pores of any one pair of the other. Thus, reciprocal fertilization takes place.
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