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Seed Plant Reproduction

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Petals usually the leafy colored parts. Sepals small leaf-like parts outside the petals ... Root = small (radicle) What's in a SEED ??? More about Seeds ... – PowerPoint PPT presentation

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Title: Seed Plant Reproduction


1
Seed Plant Reproduction
13.2
2
Some Facts
  • Flowering plants are the largest group of plants
  • Flowers are adaptations for sexual reproduction
  • An egg is fertilized by a sperm

3
Flower Parts
  • Petals ? usually the leafy colored parts
  • Sepals ? small leaf-like parts outside the petals
  • Stamen ? male reproductive organ made up of the
    filament and the anther where pollen forms
  • Pistil ? female reproductive organ made up of the
    sticky stigma, the stalk-like style, and the
    ovary
  • Ovary ? the swollen base of the pistil where
    ovules (eggs) are formed

4
How's it happen ???
  • Pollination the transfer of pollen grains
    (sperm) from the anthers to the stigmas ? occurs
    by wind, insects, birds, mammals
  • Pollen grains (sperm) land on sticky stigma
  • Pollen tube grows down into the ovary until it
    reaches the ovules (eggs)
  • Sperm travels down pollen tube and fertilizes the
    egg
  • Embryo part of seed develops
  • Seeds develop into fruit and are eventually
    dispersed
  • Germination ? the development of a seed into a
    new plant ? the time from planting until it rises
    from soil

5
Fruit
  • The ovary that surrounds the fertilized ovule
    becomes a fruit
  • The fruit swells and ripens
  • The fruit protects the developing seeds

6
Fruits
  • Fleshy fruits ? apples, oranges, peaches,
    cucumbers
  • Dry fruits ? walnuts, acorns, peanuts
  • Animals eat the fruits and disperse the seeds in
    their waste
  • Some attach to animals fur coats and are
    dispersed (burrs)

7
What's in a SEED ???
  • A seed contains the embryo of a new plant
  • Seed coat protection
  • Endosperm supply of stored food to feed plant
    until it starts making its own food
  • Cotyledons seed leaves
  • Stem small and soft
  • Root small (radicle)

8
More about Seeds
  • When fully developed the young plant inside a
    seed stops growing
  • Dormant the inactive state of a seed when
    conditions are unfavorable for growth (drought,
    freezing temperatures)
  • When in favorable conditions, seeds will sprout
    (germinate)
  • To sprout, most seeds need water, air, warm
    temps

9
Some Flower Plants Reproduce Asexually
  • Plantlets tiny plants grow on edges of leaves,
    fall off and grow on their own
  • Tuber underground stems that grow into new
    plants
  • Runners above ground stems that grow along the
    ground and produce new plants

Bryophyllum
Potato
Strawberry
10
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