"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
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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.
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