BIOL 211 – CELLULAR AND ORGANISMAL
BIOLOGY
Lecture Outline for
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
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.
Asexual –
Sexually -
Alternation of Generations
Alternation of generations: succession of haploid and diploid phases in a sexually reproducing organism
diploid zygote à sporophyte (diploid parent plant)
by mitosis, cytokinesis
Sporangia:
cells in the sporangia àhalpoid spores
by meiosis
haploid spores àgametophyte(haploid plant)
by mitosis, cytokinesis
Gametangia:
cells in the gametangia àhaploid gametes
by mitosis
Angiosperms
Spend more time as the diploid sporophyte
The sporophyte produces the flower. Within the flower are the sporangia
cells in the sporangia àhalpoid spores by meiosis
embryo sac =
egg =
pollen grain =
sperm =
pollination:
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?