NTS NAT-IM (Medical / Pre-Medical Track) Biology Reproduction — Set 2

1. Question 1

   Q1. During human embryonic development, which layer forms the lining of the digestive tract?

   • A) Ectoderm
   • B) Endoderm
   • C) Mesoderm
   • D) Trophoblast

   Answer: Endoderm

   Explanation: Endoderm forms digestive tract lining; ectoderm forms skin and nervous system.

2. Question 2

   Q2. In humans, what is the primary function of the corpus luteum?

   • A) Producing estrogen
   • B) Producing progesterone
   • C) Producing testosterone
   • D) Producing oxytocin

   Answer: Producing progesterone

   Explanation: Corpus luteum produces progesterone; estrogen is produced by follicles.

3. Question 3

   Q3. A couple is trying to conceive, and the woman's menstrual cycle is 28 days long. When is the best time for fertilization to occur?

   • A) Day 1-5
   • B) Day 10-14
   • C) Day 14-18
   • D) Day 20-24

   Answer: Day 14-18

   Explanation: Ovulation occurs on day 14; fertilization must occur within 24 hours.

4. Question 4

   Q4. What is the term for the process by which a sperm penetrates the outer layer of the egg?

   • A) Fertilization
   • B) Implantation
   • C) Cleavage
   • D) Acrosome reaction

   Answer: Acrosome reaction

   Explanation: Acrosome reaction involves penetration; fertilization is the entire process.

5. Question 5

   Q5. In humans, which hormone stimulates the release of an egg from the ovary?

   • A) FSH
   • B) LH
   • C) Estrogen
   • D) Progesterone

   Answer: LH

   Explanation: LH surge triggers ovulation; FSH stimulates follicle growth.

6. Question 6

   Q6. A man has a low sperm count, and his doctor recommends a varicocelectomy. What is the purpose of this procedure?

   • A) To remove a testicle
   • B) To repair a varicocele
   • C) To remove a cyst
   • D) To perform a vasectomy

   Answer: To repair a varicocele

   Explanation: Varicocelectomy repairs varicocele; vasectomy is for sterilization.

7. Question 7

   Q7. What is the term for the stage of embryonic development characterized by the formation of three primary germ layers?

   • A) Gastrulation
   • B) Organogenesis
   • C) Morphogenesis
   • D) Neurulation

   Answer: Gastrulation

   Explanation: Gastrulation forms germ layers; organogenesis forms organs.

8. Question 8

   Q8. In humans, which structure is responsible for the production of testosterone?

   • A) Testes
   • B) Epididymis
   • C) Vas deferens
   • D) Seminal vesicles

   Answer: Testes

   Explanation: Testes produce testosterone; epididymis stores sperm.

9. Question 9

   Q9. A woman is experiencing secondary amenorrhea, and her doctor suspects a pituitary tumor. Which hormone is likely affected?

   • A) FSH
   • B) LH
   • C) Prolactin
   • D) GnRH

   Answer: Prolactin

   Explanation: Prolactinoma can cause amenorrhea; FSH and LH are affected by GnRH.

10. Question 10

    Q10. What is the term for the process by which the embryo implants in the uterus?

    • A) Implantation
    • B) Fertilization
    • C) Cleavage
    • D) Gastrulation

    Answer: Implantation

    Explanation: Implantation occurs in the uterus; fertilization occurs in the oviduct.

11. Question 11

    Q11. In humans, which structure is responsible for the production of estrogen?

    • A) Ovaries
    • B) Adrenal glands
    • C) Hypothalamus
    • D) Pituitary gland

    Answer: Ovaries

    Explanation: Ovaries produce estrogen; adrenal glands produce androgens.

12. Question 12

    Q12. A couple is trying to conceive, and the man has a high level of FSH. What is the likely cause of his infertility?

    • A) Low sperm count
    • B) Varicocele
    • C) Testicular failure
    • D) Epididymal blockage

    Answer: Testicular failure

    Explanation: High FSH indicates testicular failure; varicocele affects sperm quality.

13. Question 13

    Q13. In humans, which hormone regulates the development of the male reproductive system?

    • A) Testosterone
    • B) Dihydrotestosterone
    • C) Estrogen
    • D) Progesterone

    Answer: Testosterone

    Explanation: Testosterone regulates male development; dihydrotestosterone is a metabolite.

14. Question 14

    Q14. A woman is experiencing polycystic ovary syndrome (PCOS), and her doctor recommends a medication to induce ovulation. Which hormone is likely affected?

    • A) FSH
    • B) LH
    • C) Estrogen
    • D) Insulin

    Answer: FSH

    Explanation: FSH is affected in PCOS; insulin resistance is a common comorbidity.

15. Question 15

    Q15. What is the term for the process by which the embryo undergoes rapid cell division without significant growth?

    • A) Cleavage
    • B) Gastrulation
    • C) Organogenesis
    • D) Morphogenesis

    Answer: Cleavage

    Explanation: Cleavage involves rapid cell division; gastrulation forms germ layers.

16. Question 16

    Q16. In humans, which structure is responsible for the production of progesterone during pregnancy?

    • A) Placenta
    • B) Ovaries
    • C) Adrenal glands
    • D) Hypothalamus

    Answer: Placenta

    Explanation: Placenta produces progesterone; ovaries produce progesterone before pregnancy.

17. Question 17

    Q17. A couple is trying to conceive, and the woman has a history of pelvic inflammatory disease (PID). What is the likely cause of her infertility?

    • A) Tubal damage
    • B) Ovulation disorder
    • C) Endometriosis
    • D) Uterine fibroids

    Answer: Tubal damage

    Explanation: PID can cause tubal damage; endometriosis affects ovulation.

18. Question 18

    Q18. In humans, which hormone regulates the onset of puberty?

    • A) GnRH
    • B) FSH
    • C) LH
    • D) Testosterone

    Answer: GnRH

    Explanation: GnRH regulates puberty; FSH and LH are affected by GnRH.

19. Question 19

    Q19. A 30-year-old woman with PCOS experiences irregular menstrual cycles. What hormone imbalance is primarily responsible for this symptom?

    • A) High estrogen and low progesterone
    • B) High progesterone and low estrogen
    • C) High androgen and low estrogen
    • D) Low FSH and high LH

    Answer: Low FSH and high LH

    Explanation: High LH disrupts ovulation, PCOS characteristic.

20. Question 20

    Q20. A couple experiences difficulty conceiving due to the man's low sperm count. What is the medical term for this condition?

    • A) Oligospermia
    • B) Asthenospermia
    • C) Teratospermia
    • D) Azoospermia

    Answer: Oligospermia

    Explanation: Oligospermia refers to low sperm count, asthenospermia to poor motility.