Site of fertilization in a mammal is ......
Ovary
Uterus
Vagina
Fallopian tube
Two major entities seen in human testis $\mathrm{TS}$ are
To reduce the weight of spermatozoan and enhance its motility nucleus undergoes which of the following change
Phallic organs in cockroach are related to
Give the name of two hormones $A$ and $B$ in the figure given below
Trace the correct path of movement of the sperms upto urethra