Lecture Outline for April 27, 2005


Topic: plant reproduction

Chapter 28 sections 28.1, 28.2

Figures used in lecture: 28.1, 28.2, 28.3, 28.4, 28.5

Additional Resources:

Asexual Reproduction discusses plants, animals, and advantages of asexual reproduction

Alternation of Generations

Sexual Reproduction in Angiosperms


Sexual Reproduction

Define/explain: life cycles, alternation of generations


You should be able to;

1. Explain the advantages of sexual reproduction vs asexual reproduction.

2. Explain the advantages of asexual reproduction.

3. Explain the purpose of sexual reproduction.



Plant Reproduction

Define/explain: sporophyte, gametophyte, spore, gamete, sepals, petals, stamen, anther, filament, pistil, stigma, style, ovary, pollen grain, pollen tube


You should be able to:

1. Describe the mechanisms plants use to reproduce asexually.

2. Describe the typical plant life cycle including the alternation of haploid and diploid phases

3. Label a diagram of a flower to identify the sepals, petals, male reproductive organs, female reproductive organs 


Plants can reproduce asexually or sexually.



Sexually -



Alternation of Generations

Alternation of generations: succession of haploid and diploid phases in a sexually reproducing organism



diploid zygote sporophyte (diploid parent plant)

by mitosis, cytokinesis



cells in the sporangia halpoid spores

by meiosis



haploid spores gametophyte(haploid plant)

by mitosis, cytokinesis



cells in the gametangia haploid gametes

by mitosis




Spend more time as the diploid sporophyte

The sporophyte produces the flower. Within the flower are the sporangia

cells in the sporangia halpoid spores by meiosis



embryo sac =


egg =



pollen grain =


sperm =







Meiosis and Fertilization in Flowers

Meiosis, female gametophyte formation, and fertilization occur in the ovules of the pistil.

Meiosis and male gametophyte formation occur in the anthers of the stamens.




Plant Reproduction

Are plants reproducing asexually or sexually?


Are sexually reproducing plants dioecious or monoecious?


Are monoecious plants simultaneous or sequential hermaphrodites?