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Chap. 30 : Plant Reproduction

Chap. 30 : Plant Reproduction. Plant Reproductive Parts A. mosses and ferns : antheridium (male) and archegonium (female) B. gymnosperms (conifers and ginkgo) : microspores (male) and megaspores (female) C. angiosperms : flowering plants 1. Flower Parts. pollen.

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Chap. 30 : Plant Reproduction

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  1. Chap. 30 : Plant Reproduction Plant Reproductive Parts A. mosses and ferns : antheridium (male) and archegonium (female) B. gymnosperms (conifers and ginkgo) : microspores (male) and megaspores (female) C. angiosperms : flowering plants 1. Flower Parts

  2. pollen Male parts : Anther Pollen-sperm Stamen Female parts : Stigma Pistil Ovary (eggs)

  3. 2. Pollen Formation stigma anther stamen Anther holds 4 pollen sacs each containing many microspores. Makes 4 pollen grains, each with 2 sperm

  4. 3.Ovule (egg) formation ovary • The ovum is the egg and is enlarged from absorbing all the divisions of the megaspores. • At the end of ovule formation there is an egg and 2 polar nuclei

  5. 4. Pollination – transfer of pollen from anther to stigma • Done by : wind, water, insects, birds, animals

  6. 5. Fertilization : Steps • 1. Pollen gets on stigma forming a pollen tube • 2. Pollen tube connects stigma to embryo sac • 3. 2 sperm travel to embryo sac • 4. 1 sperm fertilizes egg to make zygote while other unites with polar nuclei to make endosperm (food for embryo) or (fruit for animals) • 5. After fertilization the flower withers and drops off

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