Worksheet Chapter 4: Reproduction

1. Distinguish between self-pollination and cross-pollination. Why is cross-pollination commercially preferred in agriculture?

2. Explain why a pregnant mother must avoid smoking cigarettes, drinking alcohol, or taking unauthorized drugs.

3. Explain the role of the placenta and umbilical cord in supporting fetal survival during pregnancy.

4. Fill in the blank: The union of a male sperm cell and a female egg cell to form a zygote is called ________.

5. Identify the type of asexual reproduction demonstrated by each organism: (a) Bryophyllum leaf growing new plantlets along its margin, (b) Planaria regenerating after being cut, (c) Yeast producing small daughter cells.

6. True or False: Maternal blood and fetal blood mix directly within the blood vessels of the placenta.

7. Which structure in the female reproductive system is the site where an embryo implants and grows during pregnancy?

8. A woman has a regular 28-day menstrual cycle starting on the 1st day of the month. (a) On which dates is menstruation likely to occur? (b) On approximately which date will ovulation take place?

9. True or False: After fertilization in a plant, the ovule develops into a seed and the ovary matures into a fruit.

10. State two major differences between sexual reproduction and asexual reproduction.