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Plant Overview and Reproduction

Plant Overview and Reproduction

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Plant Overview and Reproduction

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  1. Plant Overview and Reproduction Pre-AP Biology Mrs. Scott

  2. What Is a Plant? • Members of the kingdom Plantae • Plants are multicellular eukaryotes • Plants have cell walls made of cellulose. • Plants develop from multicellular embryos and carry out photosynthesis using the green pigments chlorophyll a and b

  3. Overview of the Plant Kingdom • Botanists divide the plant kingdom into four groups based on three important features: • Water conducting tissues • Seeds • Flowers

  4. The Plant Life Cycle • Characterized by alternation of generations: the two generations are the haploid (N) gametophyte, or gamete-producing plant, and the diploid (2N) sporophyte, or spore-producing plant.

  5. Monocots and Dicots • Monocots and dicots are named for the number of seed leaves, or cotyledons, in the plant embryo. Monocots have one seed leaf, and dicots have two seed leafs

  6. Ultraviolet Flowers

  7. http://www.naturfotograf.com/UV_flowers_list.html

  8. Reproduction of Seed Plants Chapters 24

  9. Life Cycle of Gymnosperms • Reproduction in gymnosperms takes place in cones • Male cones produce – pollen grains • Female cones produce – ovules

  10. Flowers and Fruits • Angiosperms have unique reproductive organs known as flowers. Q: Why are flowers evolutionary adaptations? A: they attract animals that pollinate them

  11. Structure of Flowers • Flowers are reproductive organs that are composed of 4 kinds of specialized leaves

  12. Sepals • Enclose the bud before it opens, leaf-like

  13. Petals • Brightly colored, attract insects to flower

  14. Stamen • Male reproductive structure of flower, made of 2 parts • Filament – long, thin, stalk that supports the anther • Anther – makes pollen grains Anther Filament Anther + Filament = Stamen

  15. Pistil • Female reproductive structure, made of 3 parts

  16. Stigma • where pollen grains land, sticky

  17. Style • Connects stigma to ovary Style

  18. Ovary • swollen base of the pistil where ovules are formed

  19. Flowers contain ovaries, which surround and protect the seeds • After pollination, the ovary develops into a fruit, which protects the seed and aids in its dispersal.

  20. Fruit • Ripened ovary, thick wall of tissue that surrounds the seed

  21. Pollen • Pollen Grain • Contains the male gamete

  22. Pollination • The transfer of pollen from the male gametophyte to the female gametophyte

  23. Seeds • An embryo of a plant that is encased in a protective covering and surrounded by a food supply

  24. Embryo • Early development stage of a sporophyte plant • The seed’s food supply provides nutrients to the embryo as it grows

  25. Seed Coat • Surrounds and protects the embryo and keeps the contents of the seed from drying out • Can be specialized for dispersal