Genetic recombination is due to .....

In which of the following are megalecithal (macrolecithal) eggs found?

The hormone that maintains the secretory activity of the corpus luteum as well as the increase in the size of the mammary glands is

Which of the following statements are true about the female reproductive system?
$(A)$ Both estrogen and progesterone are necessary for development of follicle
$(B)$ Progesterone production is under the control of $LH$
$(C)$ The part of the oviduct is isthmus; has a narrow lumen and it joins the uterus
$(D)$ During pregnancy all events of the menstrual cycle stop and there is no menstruation
$(E)$ The graafian follicle ruptures to release the primary oocyte from the ovary by the process called ovulation

Precocious puberty is defined as:

The figure given below shows the sectional view of an ovary. Select the option which gives the correct identification of the marked structure ($A$ to $D$) and its feature.