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Goal # 7 Plant Reproduction

Goal # 7 Plant Reproduction. I. Reproductive Organs. Flower = Plant part containing all the reproductive organs of a flower. Used in plant identification Reproductive organs are responsible for Fertilization Seed production Pollination.

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Goal # 7 Plant Reproduction

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  1. Goal # 7PlantReproduction

  2. I. Reproductive Organs • Flower = Plant part containing all the reproductive organs of a flower. • Used in plant identification • Reproductive organs are responsible for • Fertilization • Seed production • Pollination

  3. 2. Petals-Colorful structures that encase the reproductive parts-used for luring in pollinators

  4. 3. Sepals • Leaflike • Encircle the peduncle below the petals • Peduncle: the base of the flower

  5. 4. Stamen • Male reproductive organ of a flower • Filament – stalk that holds up the anther • Anther • Located at the tip of the stamen • Produces pollen (plant sperm) • Pollen shakes off anther and drops onto female organs

  6. 5. Pistil • Female organ • Ovary • Bottom portion of the pistil • Contains 1+ ovules • Ovules contain 1 egg each

  7. Variations • Incomplete Flower: A flower that lacks 1+ organs • Ex) sweet corn – no petals

  8. II. Reproductive Methods

  9. Pollination • The pollen is transferred from the anther to the pistil. • By wind, water or animals • Self-Pollination • Cross-Pollination

  10. C. Plants pollinated by animals produce nectar • Nectar is a food of liquid including proteins and sugars • Collects at the base of petals • Animals trying to get the nectar get pollen on them • The animal flies to another flower and the pollen brushes off. • Plants that produce nectar attract pollinators with color/scent

  11. D. Fertilization • A pollen grain rests at the tip of the stigma • A long tube (pollen tube) grows down into the ovary. • The pollen moves into the ovule and fertilizes the egg.

  12. E. Seeds • Seeds develop from flowers • The wall of the ovule becomes the seed coat

  13. F. Fruits • The ovary enlarges and becomes the fruit • A fruit is a structure that holds the seeds • fleshy (apple/grape/tomato/cucumber) • Dry (peanuts/sunflower seeds/walnuts)

  14. G. Seed Dispersal • Animals distribute seeds by eating fruits • Raccoons, deer, bears, humans • Spit seeds • Digest seeds • Drop seeds (birds) • Bury seeds (squirrels) • Wind & Water transport seeds

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