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Plant Reproduction

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Plant Reproduction Asexual and Sexual (yes, sexual!) Asexual Reproduction Most plants reproduce asexually Does not require fertilization faster and requires less ... – PowerPoint PPT presentation

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Title: Plant Reproduction


1
Plant Reproduction
  • Asexual and Sexual(yes, sexual!)

2
Asexual Reproduction
  • Most plants reproduce asexually
  • Does not require fertilization
  • faster and requires less energy
  • Results in clones of the parent plant
  • genetically identical
  • Vegetative propagation a type of asexual
    reproduction in which new plants grow from
    nonreproductive plant parts

3
Vegetative Propagation
  • Stolons runners from the stems of parent plant
    produce buds which grow into new plants
  • crabgrass, aspen trees, strawberries

4
Vegetative Propagation
  • Rhizomes specialized stems that grow
    underground
  • bamboo and sumac trees

5
Sexual Reproduction
  • Usually requires two parent plants
  • Generates diversity in offspring
  • Flowers reproductive structures in angiosperms

6
Flower Anatomy
  • Flower parts are arranged in 4 concentric whorls
  • 1. Sepals protect flower from damage when it
    is a bud
  • 2. Petals attract pollinators
  • often very colorful

7
Flower Anatomy
  • 3. Stamens male structure that produces pollen
  • Anther tip of stamen
  • meiosis produces spores
  • develop into pollen grains (contain sperm cells)
  • Filament supports anther

8
Flower Anatomy
  • 4. Pistil female structure that produces ovules
  • Stigma sticky tip that receives pollen
  • Style narrow structure that leads pollen to
    ovary
  • Ovary develops into fruit and produces eggs in
    ovules
  • ovules develop into seeds

9
Flower Anatomy
  • Flowers may or may not have all four of the basic
    flower parts
  • Complete has all four flower parts
  • Incomplete lacks any one of the four parts
  • Perfect flowers has both stamens (male) and
    pistils (female)
  • Imperfect flowers lack either stamens or
    pistils

10
Sexual Reproduction
  • Steps in Sexual Reproduction
  • Maturation of ovules
  • Pollination
  • Fertilization
  • Seed germination

11
Pollination
  • Pollen is transferred from an anther to a stigma

12
Pollination
  • Pollen can be carried by
  • Wind
  • Water
  • Insects
  • Birds
  • Bats

13
Fertilization
  • Fertilization When the sperm and egg unite.
    Occurs inside the ovule. The zygote develops into
    the embryo.
  • Another sperm fertilizes polar nuclei to form
    endosperm (food storage)

14
Germination
  • Germination A plant emerges from the seed and
    begins to grow

15
Germination
  • Conditions necessary for seed germination
  • Proper temperature
  • Water
  • Steps in Seed Germination
  • Seed absorbs water and swells
  • Primary root develops
  • Shoot begins to grow
  • Cotyledons begin to shrivel

16
Review
  • Pollen develops
  • Pollination occurs
  • Upon pollination, stigma sends out pollen tube
    that grows through the style to the ovary
  • Sperm enters ovule (contains egg) site of
    fertilization
  • One sperm fertilizes egg and forms zygote
  • Another sperm fertilizes polar nuclei to form
    endosperm (food storage)
  • Zygote becomes plant embryo
  • Ovule becomes seed
  • Ovary develops into fruit that surrounds seed
  • Click here for BrainPop Pollination Animation
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