Question

"The graph (mensturation graph) shows the variation in the levels of ovarian hormones during various phases of menstrual cycle:     
(a) Identify ‘A’ and ‘B’.  (b) Specify the source of the hormone marked in the diagram.  (c) Reason out why A peaks before B.  (d) Compare the role of A and B.  (e) Under which condition will the level of B continue to remain high on the 28thday?"



class 12th CBSE Biology Sample paper

Answer 1

a) A - Estrogen                                                                           

    B - Progesterone

b)  A - Maturing ovarian follicle / Graafian follicle                               

     B - Corpus luteum  

c) Formation of Graaffian follicle (releases estrogen) is followed by the formation of corpus luteum (releases progesterone).

d)  Role of A (Estrogen) - leads to changes in the ovary and uterus /regeneration of endometrium through proliferation .

   Role of B (Progesterone) - Maintenance of endometrium for implantation of the fertilized ovum/ maintenance of other events of pregnancy.

e) In case of pregnancy.

Answer 2

Explanation:

above is the answers: - )