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Quiz Chapter 15: Sexual Reproduction, Development and Growth in Humans and Animals

10 questions · Form 4 Biology Bab 14: Sexual Reproduction, Development and Growth in Humans and Animals

Question 1 of 10Score: 0

What main event occurs during the stationary phase of a classic sigmoid growth curve?

Full Question List & Answer Key

Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.

1. What main event occurs during the stationary phase of a classic sigmoid growth curve?

  1. A. Rate of cell division equals the rate of cell death, resulting in zero net growth.
  2. B. Organisms experience rapid increase in biomass.
  3. C. Organisms begin active shedding of outer cuticles.
  4. D. Total cell death rate far exceeds new cell formation.
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Answer: A

In the stationary phase, overall growth reaches equilibrium as cell division rate balances cell mortality.

2. At what stage of cell division is the secondary oocyte held prior to successful fertilization by a sperm?

  1. A. Prophase I
  2. B. Anaphase I
  3. C. Metaphase II
  4. D. Telophase II
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Answer: C

During oogenesis, the secondary oocyte starts Meiosis II but pauses at Metaphase II until fertilization triggers completion.

3. Which hormone is mainly responsible for repairing and rebuilding the endometrial lining of the uterus following menstruation?

  1. A. Progesterone
  2. B. Estrogen
  3. C. Luteinizing Hormone (LH)
  4. D. Oxytocin
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Answer: B

Estrogen secreted by developing ovarian follicles promotes vascular growth and tissue repair of the endometrium during the proliferative phase.

4. What is the primary role of the fluid inside the amniotic sac surrounding the developing foetus?

  1. A. Providing metabolic nutrients directly for fetal digestion
  2. B. Acting as a shock absorber to cushion the foetus against physical impact
  3. C. Oxygenating fetal red blood cells
  4. D. Transporting maternal hormones directly into the umbilical cord
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Answer: B

Amniotic fluid protects the foetus from mechanical injury, allows free physical movement, and helps maintain body temperature.

5. During the menstrual cycle, what structural entity secretes high amounts of progesterone after ovulation occurs?

  1. A. Primary follicle
  2. B. Corpus luteum
  3. C. Anterior pituitary gland
  4. D. Endometrial lining
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Answer: B

After releasing the oocyte, the ruptured Graafian follicle transforms into the yellow corpus luteum, which secretes progesterone.

6. Why are human testes housed outside the main abdominal cavity inside the scrotum?

  1. A. To allow space for seminal fluid storage
  2. B. To maintain a lower temperature ideal for optimal spermatogenesis
  3. C. To prevent physical compression during muscle contraction
  4. D. To increase testosterone absorption directly into blood capillaries
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Answer: B

Sperm production requires a temperature 2°C to 3°C lower than core body temperature, which is maintained by the external position of the scrotum.

7. Which hormone surge directly triggers ovulation (release of the secondary oocyte) around Day 14 of the menstrual cycle?

  1. A. Follicle-Stimulating Hormone (FSH)
  2. B. Luteinizing Hormone (LH)
  3. C. Progesterone
  4. D. Human Chorionic Gonadotropin (hCG)
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Answer: B

A sharp rise in Luteinizing Hormone (LH surge) triggers the rupture of the Graafian follicle and release of the secondary oocyte.

8. How many functional mature ova are produced from a single primary oocyte at the completion of oogenesis?

  1. A. 4
  2. B. 2
  3. C. 1
  4. D. 8
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Answer: C

Oogenesis produces only 1 functional, nutrient-rich ovum along with 3 tiny polar bodies that degenerate.

9. Why does maternal blood and fetal blood remain separated inside the placenta?

  1. A. To allow fast diffusion of red blood cells
  2. B. To protect fragile fetal capillaries from high maternal blood pressure and prevent agglutination from incompatible blood groups
  3. C. To prevent all hormones from crossing into the foetus
  4. D. Because maternal blood contains no dissolved oxygen
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Answer: B

Separation of blood streams prevents damage to delicate fetal microvessels and avoids fatal immune reactions if blood types differ.

10. Which structure connects the embryo to the placenta and houses blood vessels for exchange?

  1. A. Amniotic sac
  2. B. Umbilical cord
  3. C. Chorionic villi
  4. D. Allantois
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Answer: B

The umbilical cord links the fetal abdomen to the placenta, carrying umbilical arteries and veins.

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