Which of the following provides nutrition to sperm?
Leydig's cell
Scrotum
Sertoli's cell
Epididymis
Identify $A$ to $F$ in the diagram given below
Heterogametic male condition does not occur in
Identify $A, B, C$ and $D$ in the figure given below
Mammalian embryo is directly surrounded by
Sperm lysins contains