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Biology · 2025 · 4 marks
CBSE 2025 · Region 1 · Set 1 · Q29
Study the graphs given below for Case 1 and Case 2 showing different levels of certain hormones and answer the question that follows: (a) Which…
Study the graphs given below for Case $\displaystyle 1$ and Case $\displaystyle 2$ showing different levels of certain hormones and answer the question that follows :
(a)
Which hormone is responsible for the peak observed in Case $\displaystyle 1$ and Case $\displaystyle 2$ ? Write one function of that hormone.
(b)
Write changes that take place in the ovary and uterus during follicular phase.
Student to attempt either sub-part (c) or (d) :
(c)
Name the hormone Q of Case 2. Write one function of hormone Q.
OR
(d)
Which structure in the ovary will remain functional in Case $\displaystyle 2$ ? How is it formed ?
Marking-scheme solution
(a)
Luteinising hormone /LH , helps in ovulation / induce rupturing of graafian follicles
(b)
Ovary : Maturation of follicles.
Uterus : Proliferation of endometrium lining.
(c)
Q - Progesterone , Maintains pregnancy / maintenance of endometrium
OR
(d)
Corpus luteum, Graafian follicle transforms into corpus luteum after ovulation
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CBSE Class 12 Biology past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.