NEET Biology Human Reproduction MCQs Set 29

Multiple Choice Questions (MCQs) for NEET Biology: Human Reproduction

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Multiple Choice Questions

Question 1: Changes in GnRH pulse frequency in females is controlled by circulating levels of
(a) Progesterone and inhibin
(b) Estrogen and progesterone
(c) Estrogen and inhibin
(d) Progesterone only
Show Answer & Explanation

Answer: (b) Estrogen and progesterone

Explanation:
1. High level of estrogen and progesterone gives negative feedback to hypothalamus for the release of GnRH.

Question 2: Select the incorrect statement :
(a) LH triggers secretion of androgens from the Leydig cells
(b) FSH stimulates the sertoli cells which help in spermiogenesis
(c) LH triggers ovulation in ovary
(d) LH and FSH decrease gradually during the follicular phase
Show Answer & Explanation

Answer: (d) LH and FSH decrease gradually during the follicular phase

Explanation:
1. In follicular phase of menstrual cycle, LH and FSH increase gradually.

Question 3: Ectopic pregnancies are referred to as
(a) Pregnancies terminated due to hormonal imbalance
(b) Pregnancies with genetic abnormality
(c) Implantation of embryo at site other than uterus
(d) Implantation of defective embryo in the uterus
Show Answer & Explanation

Answer: (c) Implantation of embryo at site other than uterus

Explanation:
1. Any extra uterine pregnancy is ectopic pregnancy.
2. Implantation can occur in the wall of abdominal cavity, ovaries but 90-95% of ectopic pregnancies are tubal pregnancy where implantation occurs in fallopian tube.

Question 4: Which of the following events is not associated with ovulation in human female?
(a) LH surge
(b) Decrease in estradiol
(c) Full development of Graafian follicle
(d) Release of secondary oocyte
Show Answer & Explanation

Answer: (b) Decrease in estradiol

Explanation:
1. In 28 days reproductive cycle, ovulation occurs on 14th day due to LH surge.
2. In the mid cycle, the level of FSH and estrogen are also high.
3. The female gamete is released from the ovary in secondary oocyte stage after completing meiosis I.

Question 5: In human females, meiosis-II is not completed until?
(a) Birth
(b) Puberty
(c) Fertilization
(d) Uterine implantation
Show Answer & Explanation

Answer: (c) Fertilization

Explanation:
1. In human females, meiosis II is completed after the entry of sperm into the cytoplasm of secondary oocyte at the time of fertilisation leading to the formation of ovum and IInd polar body.

Question 6: Which of these is not an important component of initiation of parturition in humans?
(a) Release of prolactin
(b) Increase in estrogen and progesterone ratio
(c) Synthesis of prostaglandins
(d) Release of oxytocin
Show Answer & Explanation

Answer: (a) Release of prolactin

Explanation:
1. At the time of parturition there is decrease in progesterone; release of prostaglandins and oxytocin, this will stimulate the contraction of smooth muscles of uterus.

Question 7: Hysterectomy is surgical removal of
(a) Mammary glands
(b) Uterus
(c) Prostate gland
(d) Vas-deference
Show Answer & Explanation

Answer: (b) Uterus

Explanation:
1. Uterus is also called as hystera.
2. So, removal of uterus is hysterectomy.

Question 8: Menstrual flow occurs due to lack of
(a) FSH
(b) Oxytocin
(c) Vasopressin
(d) Progesterone
Show Answer & Explanation

Answer: (d) Progesterone

Explanation:
1. Progesterone maintains endometrium Endometrium is shed during menstruation due to low levels of progesterone.

Question 9: What is the correct sequence of sperm formation?
(a) Spermatogonia, spermatocyte, spermatozoa, spermatid
(b) Spermatogonia, spermatozoa, spermatocyte, spermatid
(c) Spermatogonia, spermatocyte, spermatid, spermatozoa
(d) Spermatid, spermatocyte, spermatogonia, spermatozoa
Show Answer & Explanation

Answer: (c) Spermatogonia, spermatocyte, spermatid, spermatozoa

Explanation:
1. Meiosis-I Meiosis-II Spermatogonia Primary Secondary Spermatid Sperm spermatocyte Spermatocyte (2n) (2n) (n) (n) (n) differentiation Number 1X 2X 4X 4X.

Question 10: Which one of the following is not the function of placenta? It
(a) Secretes estrogen
(b) Facilitates removal of carbon dioxide and waste material from embryo
(c) Secretes oxytocin during parturition
(d) Facilitates supply of oxygen and nutrients to embryo
Show Answer & Explanation

Answer: (c) Secretes oxytocin during parturition

Explanation:
1. Oxytocin is secreted by anterior pituitary of mother.

Question 11: In a normal pregnant woman, the amount of total gonadotropin activity was assessed. The result expected was
(a) High level of circulating HCG to stimulate estrogen and progesterone synthesis
(b) High level of circulating FSH and LH in the uterus to stimulate implantation of the embryo
(c) High level of circulating HCG to stimulate endometrial thickening
(d) High levels of FSH and LH in uterus to stimulate endometrial thickening
Show Answer & Explanation

Answer: (a) High level of circulating HCG to stimulate estrogen and progesterone synthesis

Explanation:
1. hCG (= human chorionic gonadotropin) stimulates corpus luteum to secrete progesterone and estrogen.

Question 12: Signals for parturition originate from
(a) Fully developed foetus only
(b) Both placenta as well as fully developed foetus
(c) Oxytocin released from maternal pituitary
(d) Placenta only
Show Answer & Explanation

Answer: (b) Both placenta as well as fully developed foetus

Explanation:
1. Fully developed foetus and placenta stimulate foetal ejection reflex, which triggers release of oxytocin from maternal pituitary.

Question 13: Which one of the following statements is false in respect of viability of mammalian sperm?
(a) Sperms must be concentrated in a thick suspension
(b) Sperm is viable for only up to 24 hours
(c) Survival of sperm depends on the pH of the medium and is more active in alkaline medium
(d) Viability of sperm is determined by its motility
Show Answer & Explanation

Answer: (b) Sperm is viable for only up to 24 hours

Explanation:
1. Sperm is viable for 48-72 hours.

Question 14: The secretory phase in the human menstrual cycle is also called
(a) Follicular phase and lasts for about 13 days
(b) Luteal phase and lasts for about 6 days
(c) Follicular phase lasting for about 6 days
(d) Luteal phase and lasts for about 13 days
Show Answer & Explanation

Answer: (d) Luteal phase and lasts for about 13 days

Explanation:
1. Uterus Ovary Duration Secretory phase luteal phase 14 days Proliferative phase follicular phase about 10 days.

Question 15: The Leydig cells as found in the human body are the secretory source of
(a) Glucagon
(b) Androgens
(c) Progesterone
(d) Intestinal mucus
Show Answer & Explanation

Answer: (b) Androgens

Explanation:
1. LH stimulates Leydig cells to secrete androgens.

Question 16: The testes in humans are situated outside the abdominal cavity inside a pouch called scrotum. The purpose served is for
(a) Providing a secondary sexual feature for exhibiting the male sex
(b) Maintaining the scrotal temperature lower than the internal body temperature
(c) Escaping any possible compression by the visceral organs
(d) Providing more space for the growth of epdidymis
Show Answer & Explanation

Answer: (b) Maintaining the scrotal temperature lower than the internal body temperature

Explanation:
1. Spermatogenesis requires 2.5°C lower than the body temperature.

Question 17: If for some reason, the vasa efferentia in the human reproductive system get blocked, the gametes will not be transported from
(a) Vagina to uterus
(b) Testes to epididymis
(c) Epididymis to vas deferens
(d) Ovary to uterus
Show Answer & Explanation

Answer: (b) Testes to epididymis

Explanation:
1. Vasa efferentia or ductuli efferentes connect rete testis to epididymis, part of the extratesticular duct system.

Question 18: What happens during fertilisation in humans after many sperms reach close to the ovum?
(a) Cells of corona radiata trap all the sperms except one
(b) Only two sperms nearest the ovum penetrate zona pellucida
(c) Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida
(d) All sperms except the one nearest to the ovum lose their tails
Show Answer & Explanation

Answer: (c) Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida

Explanation:
1. Zona reaction makes the zona pellucida impervious to second sperm by destroying sperm receptors.

Question 19: In human female the blastocyst
(a) Forms placenta even before implantation
(b) Gets implanted into uterus 3 days after ovulation
(c) Gets nutrition from uterine endometrial secretion only after implantation
(d) Gets implanted in endometrium by the trophoblast cells
Show Answer & Explanation

Answer: (d) Gets implanted in endometrium by the trophoblast cells

Explanation:
1. Placenta is formed after implantation.
2. Blastocyst gets implanted about 7 days after fertilization.
3. As morula enters the uterus, it gets rich supply of nutrients from endometrial fluid.

Question 20: Which one of the following statements about morula in humans is correct?
(a) It has more cytoplasm and more DNA than an uncleaved zygote
(b) It has almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA
(c) It has far less cytoplasm as well as less DNA than in an uncleaved zygote
(d) It has more or less equal quantity of cytoplasm and DNA as in uncleaved zygote
Show Answer & Explanation

Answer: (b) It has almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA

Explanation:
1. During cleavage, there is no increase in mass of cytoplasm of developing embryo.
2. There is increase in DNA content.
3. Interphase is without growth phase.

Question 21: Secretions from which one of the following are rich in fructose, calcium and some enzymes?
(a) Male accessory glands
(b) Liver
(c) Pancreas
(d) Salivary glands
Show Answer & Explanation

Answer: (a) Male accessory glands

Explanation:
1. Male accessory glands  seminal vesicles, prostate gland and bulbourethral glands.

Question 22: Seminal plasma in humans is rich in
(a) Fructose and calcium but has no enzymes
(b) Glucose and certain enzymes but has no calcium
(c) Fructose and certain enzymes but poor in calcium
(d) Fructose, calcium and certain enzymes
Show Answer & Explanation

Answer: (d) Fructose, calcium and certain enzymes

Explanation:
1. Fructose is energy yielding substrate, required for motility.

Question 23: Which one of the following is the most likely root cause why menstruation is not taking place in regularly cycling human female?
(a) Maintenance of the hypertrophical 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
Show Answer & Explanation

Answer: (d) Fertilisation of the ovum

Explanation:
1. Root cause of menstruation is unfertilized ovum.

Question 24: In the human female, menstruation can be deferred by the administration of
(a) FSH only
(b) LH only
(c) Combination of FSH and LH
(d) Combination of estrogen and progesterone
Show Answer & Explanation

Answer: (d) Combination of estrogen and progesterone

Explanation:
1. Progesterone is essential for maintenance of endometrium, which is thickened by estrogen.
2. Menstrual flow occurs due to the breakdown of endometrial lining of uterus as a result of fall in level of progesterone.

Question 25: Grey crescent is the area
(a) At the point of entry of sperm into ovum
(b) Just opposite to the site of entry of sperm into ovum
(c) At the animal pole
(d) At the vegetal pole
Show Answer & Explanation

Answer: (b) Just opposite to the site of entry of sperm into ovum

Explanation:
1. Grey crescent is the area formed opposite to the point of entry of sperm in animal half.
2. It is observed in frog during fertilization.

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