Question

Student to attempt either option (A) or (B):
 
(i) Identify ‘P’ and ‘Q’ labelled in the diagram. 
(ii) Specify the source of the hormone ‘P’ and ‘Q’ marked in the diagram. 
OR  
(i) Identify ‘P’ and ‘Q’ labelled in the above diagram. 
(ii) Write down the role of hormone ‘P’ in both males and females.

Hint:

Pituitary hormones like LH and FSH regulate ovarian function in females and testicular activity in males; LH shows a sharp peak at ovulation.

Answer 1

Option (A):
Step 1: In the ovarian hormone graph, hormone ‘P’ is progesterone and hormone ‘Q’ is estrogen. 
Step 2: Progesterone (P) is secreted by the corpus luteum after ovulation. Estrogen (Q) is primarily secreted by the growing follicles (Graafian follicle) in the ovary. 
OR  
Option (B): 
Step 1: In the pituitary hormone graph, hormone ‘P’ is Luteinising Hormone (LH) and hormone ‘Q’ is Follicle Stimulating Hormone (FSH). 
Step 2: In females, LH triggers ovulation and formation of the corpus luteum. In males, LH stimulates Leydig cells to produce testosterone.