Human Reproduction

NEET Biology · 134 questions · Page 11 of 14 · Click an option or "Show Solution" to reveal answer

Q101

Which one of the following is the most likely root cause why menstruation is not taking place in a regularly cycling human female?

A maintenance of the hypertrophied endometrial lining

B maintenance of high concentration of sex hormones in the blood stream

C retention of well-developed corpus luteum

D fertilisation of the ovum

Correct Answer

Option D

Solution

(d) Fertilization of the ovum prevents menstruation by maintaining corpus luteum.

Q102

The second maturation division of the mammalian ovum occurs

A shortly after ovulation before the ovum enters the fallopian tube

B after the ovum has been penetrated by a sperm

C until the nucleus of the sperm has fused with that of the ovum

D in the graafian follicle following the first maturation division

Correct Answer

Option B

Solution

(b) Second meiotic division (meiosis II) completes after penetration of the ovum by a sperm.

Q103

About which day in a normal human menstrual cycle does rapid secretion of LH (LH-surge) occur?

A 14th day

B 20th day

C 5th day

D 11th day

Correct Answer

Option A

Solution

(a) LH surge occurs on approximately 14th day of the menstrual cycle, triggering ovulation.

Q104

What happens during fertilisation in humans after many sperms reach close to the ovum?

A Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida

B All sperms except the one nearest to the ovum lose their tails

C Cells of corona radiata trap all the sperms except one

D Only two sperms nearest the ovum penetrate zona pellucida

Correct Answer

Option A

Solution

(a) Acrosomal secretions (hydrolytic enzymes) help one sperm penetrate zona pellucida.

Q105

The amnion of mammalian embryo is derived from

A ectoderm and mesoderm

B endoderm and mesoderm

C ectoderm and endoderm

D mesoderm and trophoblast

Correct Answer

Option A

Solution

(a) Amnion is derived from mesoderm (outer) and ectoderm (inner).

Q106

In a normal pregnant woman, the amount of total gonadotropin activity expected was

A High level of circulating FSH and LH in the uterus to stimulate implantation

B High level of circulating HCG to stimulate endometrial thickening

C High level of FSH and LH in uterus to stimulate endometrial thickening

D High level of circulating HCG to stimulate estrogen and progesterone synthesis

Correct Answer

Option D

Solution

(d) HCG maintains corpus luteum and stimulates estrogen and progesterone synthesis during pregnancy.

Q107

Menstrual flow occurs due to lack of:

A FSH

B Oxytocin

C Vasopressin

D Progesterone

Correct Answer

Option D

Solution

(d) Degeneration of corpus luteum reduces progesterone, causing the endometrial lining to break down.

Q108

Select the correct option describing gonadotropin activity in a normal pregnant female:

A High level of estrogen stimulates the thickening of endometrium.

B High level of FSH and LH inhibit implantation of the embryo.

C High level of hCG stimulates the synthesis of estrogen and progesterone.

D High level of hCG stimulates the thickening of endometrium.

Correct Answer

Option C

Solution

Q109

In human females, meiosis-II is not complete until?

A fertilization

B uterine implantation

C birth

D puberty

Correct Answer

Option A

Solution

(a) Meiosis-II in human females is completed only after fertilization occurs.

Q110

Which of the following events is not associated with ovulation in human female?

A Full development of Graafian follicle

B Release of secondary oocyte

C LH surge

D Decrease in estradiol

Correct Answer

Option D

Solution

(d) Estradiol increases before ovulation (triggers LH surge), not decreases.

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