Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. [2024]
Assertion A: FSH acts upon ovarian follicles in female and Leydig’s cells in male.
Reason R: Growing ovarian follicles secrete estrogen in female while interstitial cells secrete androgen in male human being.
In the light of the above statements, choose the correct answer from the options given below:
Both A and R are true and R is the correct explanation of A.
Both A and R are true but R is NOT the correct explanation of A.
A is true but R is false.
A is false but R is true.
(4)
In males, FSH acts on the Sertoli cells and stimulates to secrete some factors which help in the process of spermiogenesis.
Which of the following statements are correct regarding female reproductive cycle? [2023]
A. In non-primate mammals cyclical changes during reproduction are called oestrus cycle.
B. First menstrual cycle begins at puberty and is called menopause.
C. Lack of menstruation may be indicative of pregnancy.
D. Cyclic menstruation extends between menarche and menopause.
Choose the most appropriate answer from the options given below:
A, B and C only
A, C and D only
A and D only
A and B only
(2)
The first menstruation begins at puberty and is called menarche. Menstrual cycle ceases around 50 years of age in human females, that is called menopause.
Which of the following hormone levels will cause release of ovum (ovulation) from the Graafian follicle? [2020]
High concentration of Estrogen
High concentration of Progesterone
Low concentration of LH
Low concentration of FSH
(1)
FSH, LH and estrogen are at peak during ovulation (release of ovum).
No new follicles develop in the luteal phase of the menstrual cycle because [2019]
follicles do not remain in the ovary after ovulation
FSH levels are high in the luteal phase
LH levels are high in the luteal phase
both FSH and LH levels are low in the luteal phase
Match the items given in column I with those in column II and select the correct option given below. [2018]
| Column I | Column II | ||
| A. | Proliferative phase | (i) | Breakdown of endometrial lining |
| B. | Secretory phase | (ii) | Follicular phase |
| C. | Menstruation | (iii) | Luteal phase |
A → (iii), B → (ii), C → (i)
A → (i), B → (iii), C → (ii)
A → (ii), B → (iii), C → (i)
A → (iii), B → (i), C → (ii)
Changes in GnRH pulse frequency in females is controlled by circulating levels of [2016]
progesterone only
progesterone and inhibin
estrogen and progesterone
estrogen and inhibin
(3)
GnRH is secreted by the hypothalamus which stimulates the anterior lobe of pituitary gland to secrete luteinising hormone (LH) and follicle stimulating hormone (FSH). FSH stimulates the growth of the ovarian follicles and stimulates the formation of estrogens. LH stimulates the corpus luteum to secrete progesterone. Rising levels of progesterone and estrogen inhibits the release of GnRH, which in turn, inhibits the production of FSH and LH.
Select the incorrect statement. [2016]
LH and FSH decrease gradually during the follicular phase.
LH triggers secretion of androgens from the Leydig cells.
FSH stimulates the Sertoli cells which help in spermiogenesis.
LH triggers ovulation in ovary.
(1)
During follicular phase, FSH secretion increases. Follicular phase (proliferative phase) usually includes cycle days 6-13 or 14 in a 28 days cycle. The follicle stimulating hormone (FSH) secreted by the anterior lobe of the pituitary gland stimulates the ovarian follicle to secrete estrogen.
Identify the correct statement on ‘inhibin’. [2016]
Is produced by granulosa cells in ovary and inhibits the secretion of LH
Is produced by nurse cells in testes and inhibits the secretion of LH
Inhibits the secretion of LH, FSH and prolactin
Is produced by granulosa cells in ovary and inhibits the secretion of FSH
Which of the following events is not associated with ovulation in human female? [2015]
Release of secondary oocyte
LH surge
Decrease in estradiol
Full development of Graafian follicle
(3)
In human females, ovulation is the release of secondary oocyte from the ovary at about 14th day of the menstrual cycle. Both LH and FSH attain a peak level during this period. Rapid secretion of LH induces rupturing of fully developed Graafian follicle and thereby release of ovum. LH surge is actually responsible for ovulation.
The main function of mammalian corpus luteum is to produce [2014]
estrogen only
progesterone
human chorionic gonadotropin
relaxin only
(2)
Corpus luteum secretes steroid hormones progesterone and estrogen, to make uterus suitable for implantation (in case fertilisation occurs) and its maintenance (mainly endometrium).
