notes of sexual reproduction of flowering plants
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The fusion of two dissimilar sexual reproductive units (gametes) is called fertilization. This process was discovered by Strasburger (1884). (1) Germination of pollen grain on stigma and growth of pollen tube: Pollen grains reach the receptive stigma of the carpel by the act of pollination.
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(i) A flower has following parts arranged in four whorls, i.e. calyx (sepals), corolla (petals), androecium and gynoecium. These are attached to central axis called thalamus. (iii) Flowers may contain both male (stamens) and female (carpels or pistils) reproductive parts or organs in it and is called bisexual.
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