Internal ear develops from
Ectoderm
Endoderm
Mesoderm
None of the above
The yolk plug is a structure in gastrula which is formed by the protrusion of
The figure given below illustrates the changes taking place during the human menstruation cycle
Identify hormones $A, B, C, D$ and $E$ from the figures
In the boxes shown in the figure write the name of the hormone (or hormones) controlling the stage in the human menstrual cycle
$A$ : Most birds possess only the left ovary and left oviduct for conveying the ovum released from the ovary.
$R$ : The avian ovary does not form a corpus luteum from the ruptured ovarian follicle which undergoes rapid shrinkage
Nebenkern is a part of
Function of fertilizin is/are