Worksheet Chapter 6: Sexual Reproduction in Flowering Plants

1. True or False: The triploid endosperm nucleus develops from the fusion of one haploid male gamete with one polar nucleus.

2. Fill in the blank: The process in flowering plants where one male gamete fuses with the egg cell and another fuses with two polar nuclei is called ________.

3. Explain the fate of the four megaspores produced after meiosis of a megaspore mother cell in the ovule.

4. True or False: The integuments of the ovule mature into the fruit pericarp post-fertilization.

5. Describe the events of double fertilization that occur once the pollen tube penetrates the embryo sac.

6. Explain post-fertilization changes that transform flower structures into seed and fruit components.

7. State two functions of the pollen tube during fertilisation in flowering plants.

8. Name the two nuclei contained inside a germinating pollen grain and state their respective roles.

9. Which cell structure in a mature embryo sac is directly fertilized by a male gamete to form a diploid zygote?

10. Discuss two biological significances of double fertilization in angiosperms and explain what would happen if the second fertilization failed to occur.