Animals with Reproduction Dependent on Internal Fertilization Need Not Have

Question

Animals with reproduction dependent on internal fertilization need not have
A)any copulatory organs.
B)a receptacle that receives sperm.
C)behavioural interaction between males and females.
D)internal development of embryos.
E)haploid gametes.

Accepted Answer

Internal fertilization implies that the sperm and eggs meet and fuse inside the female's body. Therefore, for internal fertilization, the embryos must develop internally as well. This rules out option E (haploid gametes) which refers to external fertilization. The presence of copulatory organs and the need for behavioral interaction between males and females are common features of internal fertilization, ruling out options A and C. Option B refers to the female's ability to store and retain sperm, which is a common anatomical adaptation for internal fertilization but is not an absolute requirement. Thus, the best choice for the answer is option D.