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SEEDS.

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Presentation on theme: "SEEDS."— Presentation transcript:

1 SEEDS

2 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

3 Pollination and Fertilisation
pollen pollen tube antipodal cells 2 polar nuclei egg cell tube nucleus 2 male gametes 2 synergid cells

4 Double fertilization

5 hilum raphe Seed coat a. testa Endosperm b. tegmen funiculus aril
micropyle Endosperm seed without endosperm exalbuminous (non-endospermous) seed with endosperm albuminous (endospermous)

6 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)

7 Dicotyledonous seed (with endosperm)
caruncle raphe radicle shoot apex cotyledons seed coat endosperm Dicotyledonous seed (with endosperm)

8 Rubber seeds Castor oil seeds

9 Dicotyledonous seed (with endosperm)
seed coat embryo cotyledon endosperm shoot apex radicle Dicotyledonous seed (with endosperm)

10 Chilli Chilli seeds

11 Dicotyledonous seed (without endosperm)
raphe hilum micropyle cotyledon seed coat radicle plumule Dicotyledonous seed (without endosperm)

12 Bean seeds

13 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)

14 Maize seed

15 Glumes Paddy seed

16 Germination of dicotyledonous seed (epigeal)
Epicotyl

17 Germination of monocotyledonous seed (hypogeal)


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