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SEEDS
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Ovule Structure chalaza raphe nucellus outer intergument
antipodal cells polar nuclei egg cell synergid cell chalaza nucellus outer intergument inner intergument embryo sac micropyle funiculus
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Pollination and Fertilisation
pollen pollen tube antipodal cells 2 polar nuclei egg cell tube nucleus 2 male gametes 2 synergid cells
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Double fertilization
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hilum raphe Seed coat a. testa Endosperm b. tegmen funiculus aril
micropyle Endosperm seed without endosperm exalbuminous (non-endospermous) seed with endosperm albuminous (endospermous)
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3. Perisperm - originates from nucellus tissue
4. Embryo a. cotyledon / scutellum (in monocot) b. plumule c. radicle d. epicotyl e. hypocotyl f. coleoptyle (in monocot) g. coleorrhiza (in monocot) Types of seed germination: a. epigeal (in dicot) b. hypogeal (in monocot)
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Dicotyledonous seed (with endosperm)
caruncle raphe radicle shoot apex cotyledons seed coat endosperm Dicotyledonous seed (with endosperm)
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Rubber seeds Castor oil seeds
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Dicotyledonous seed (with endosperm)
seed coat embryo cotyledon endosperm shoot apex radicle Dicotyledonous seed (with endosperm)
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Chilli Chilli seeds
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Dicotyledonous seed (without endosperm)
raphe hilum micropyle cotyledon seed coat radicle plumule Dicotyledonous seed (without endosperm)
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Bean seeds
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Monocotyledonous seed (with endosperm)
pericarp and fused seed coat endosperm aleurone layer caryopsis coat scutellum (cotyledon) coleoptile first leaves shoot apex radicle coleorhiza Monocotyledonous seed (with endosperm)
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Maize seed
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Glumes Paddy seed
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Germination of dicotyledonous seed (epigeal)
Epicotyl
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Germination of monocotyledonous seed (hypogeal)
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