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

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

Question 1 of 10Score: 0

What type of growth curve is produced when measuring the body length of an insect over time?

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 type of growth curve is produced when measuring the body length of an insect over time?

  1. A. Smooth S-shaped (sigmoid) curve
  2. B. Intermittent step-like curve
  3. C. Straight linear curve
  4. D. Bell-shaped normal distribution curve
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Answer: B

Insects display a staircase/step-like (intermittent) growth curve because actual body expansion only occurs in brief bursts following ecdysis.

2. What is the primary role of the acrosome located at the head of a mature sperm cell?

  1. A. Producing ATP for flagellar propulsion
  2. B. Containing hydrolytic enzymes to digest the outer protective layer of the oocyte
  3. C. Storing genetic material in haploid form
  4. D. Binding nutrients from seminal plasma
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Answer: B

The acrosome contains digestive enzymes (such as hyaluronidase) that break down the corona radiata and zona pellucida surrounding the secondary oocyte.

3. What process allows insects with a hard chitinous exoskeleton to increase in body size during growth?

  1. A. Metamorphosis
  2. B. Ecdysis
  3. C. Gametogenesis
  4. D. Parthenogenesis
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Answer: B

Ecdysis is the periodic shedding of the rigid outer exoskeleton, enabling soft underlying tissues to expand before the new cuticle hardens.

4. Which structural feature of the umbilical cord carries oxygenated blood and nutrients from the placenta to the foetus?

  1. A. Two umbilical arteries
  2. B. One umbilical vein
  3. C. Two umbilical veins
  4. D. One umbilical artery
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Answer: B

The single umbilical vein transports oxygen-rich blood and nutrient supply from the placenta directly to the developing foetus.

5. Which phase of the sigmoid growth curve represents the maximum rate of cell division and rapid growth?

  1. A. Lag phase
  2. B. Exponential (Log) phase
  3. C. Decelerating phase
  4. D. Stationary phase
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Answer: B

The exponential or log phase is characterized by rapid, active cell division resulting in the fastest rate of growth.

6. What is the key physiological function of Human Chorionic Gonadotropin (hCG) secreted by the early blastocyst?

  1. A. Stimulating milk production in mammary glands
  2. B. Maintaining the corpus luteum so it continues secreting progesterone and estrogen
  3. C. Inhibiting uterine wall thickening during early pregnancy
  4. D. Inducing strong uterine muscle contractions during labor
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Answer: B

hCG prevents corpus luteum degeneration during early pregnancy, ensuring ongoing progesterone production to maintain the endometrium.

7. 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.

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. 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.

10. What condition describes the growth of endometrial tissue outside the uterine cavity, often leading to severe pelvic pain and infertility?

  1. A. Endometriosis
  2. B. Preeclampsia
  3. C. Fibroids
  4. D. Cervical dysplasia
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Answer: A

Endometriosis occurs when endometrial tissue grows ectopically (e.g., on ovaries or Fallopian tubes), causing inflammation and scarring.

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