The figure shows a section of human ovary. Select the option which gives the correct identification of either A or B with function/characteristic.
1
B- Corpus luteum - Secretes progesterone
2
A- Tertiary follicle - Forms Graafian follicle
3
B- Corpus luteum - Secretes estrogen
4
A- Primary oocyte - It is in the prophase-1 of the meiotic division
Official Solution
Correct Option: (1)
The zona granulosa and theca cells of Graafian follicle remaining in the ovary after ovulation and some surrounding capillaries and connective tissue evolve into the corpus luteum (a temporary endocrine gland). The corpus luteum produces progesterone and, in the event of fertilization, provides the required progesterone until the placenta is formed. In the absence of fertilization, the life span of the corpus luteum is 14 days. It then degenerates into a corpus albicans, which is mainly a scar tissue.
02
PYQ 2013
medium
biologyID: neet-ug-
Menstrual flow occurs due to lack of
1
Progesterone
2
FSH
3
Oxytocin
4
Vasopressin
Official Solution
Correct Option: (1)
The correct option is (A): Progesterone.
03
PYQ 2014
medium
biologyID: neet-ug-
The main function of mammalian corpus luteum is to produce:
1
Progesterone
2
Human chorionic gonadotropin
3
Relaxin only
4
Estrogen only
Official Solution
Correct Option: (2)
The correct option (B): Human chorionic gonadotropin.
04
PYQ 2019
medium
biologyID: neet-ug-
The accompanying diagram shows the changes that take place in the endometrium during a normal menstrual cycle. Identify the changes and select the correct option.
1
a
2
b
3
c
4
d
Official Solution
Correct Option: (3)
Menstruation occurs for days and ovulation occurs on day of a normal menstrual cycle.
05
PYQ 2024
medium
biologyID: neet-ug-
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: During menstrual cycle, the ovulation takes place approximately on 14th day. Reason R: Rapid secretion of LH in the middle of menstrual cycle induces rupture of Graafian follicle and thereby the release of ovum. In the light of the above statements, choose the most appropriate answer from the options given below.
1
A is correct but R is not correct.
2
A is not correct but R is correct.
3
Both A and R are correct and R is the correct explanation of A.
4
Both A and R are correct but R is NOT the correct explanation of A.
Official Solution
Correct Option: (3)
Both Assertion A and Reason R are correct, and R provides a valid explanation for A. The LH surge in the middle of the menstrual cycle triggers ovulation.
