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

1. Describe the physiological process of ecdysis in insects and explain why their growth curve appears step-like.

2. True or False: Dizygotic (fraternal) twins are derived from a single fertilized ovum that splits into two separate embryos.

3. State two key differences between Spermatogenesis and Oogenesis.

4. Compare identical (monozygotic) twins and fraternal (dizygotic) twins.

5. Which hormone surge directly triggers ovulation on approximately Day 14 of the human menstrual cycle?

6. Fill in the blank: The organ that provides a metabolic link for nutrient and gas exchange between maternal and fetal blood without letting them mix is called the ________.

7. Explain why the blood of the mother and the blood of the foetus must remain strictly separated inside the placenta.

8. Differentiate between the Exponential (Log) Phase and the Stationary Phase of a standard sigmoid growth curve.

9. True or False: Umbilical arteries carry oxygenated, nutrient-rich blood from the mother's placenta to the foetus.

10. Explain the role of Progesterone in maintaining the uterine endometrium during pregnancy.