The estrus cycle can be divided into how many phases?
A
Three
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
Four
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
Five
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
One
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution
The correct option is A Four
The reproductive cycle of the non-primate females is called estrous cycle. For example, in rats, horse etc. It can be divided into four phases proestrus, estrus, metestrus and diestrus. Proestrus stage is the building up phase. The ovarian follicle becomes large and secretes estrogen which is necessary for the preparation of estrus and pregnancy. Estrus is the phase when ovulation takes place. In this phase, female is sexually receptive. Metestrus is the phase where corpus luteum forms under the influence of decreased estrogen and increased progesterone level. Diestrus is the phase where corpus luteum becomes functional and the progesterone level increases. So, the correct option is B.