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CHAPTER 2 PPTSEXUAL REPRODUCTION IN
FLOWERING PLANTSPREPARED BY ASHA GOPALAKRISHNA
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L.S OF A FLOWER
L.S.OF A FLOWER
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Three dimensional cut section of an anther
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Anther- T.S young and mature dehisced
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T.S of anther young and mature
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MicrosporogenesisPMC (2n) MICROSPORE(n)
MEIOSIS
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Pollen grain tetrad
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POLLEN GRAINS
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Stages of microspore maturing into a pollen grain
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Pollen grains-rich in nutrients
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Diagrammatic view of anatropous ovule
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MEGASPOROGENESISMMC(2n) MEGASPORE(n)
MEIOSIS
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Megasporogenesis
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Differences between microsporogenesis and
megasporogenesisMICROSPOROGENESIS MEGASPOROGENESIS
1. The formation of microspore from pollen mother cell by meiosis
1. The formation of megaspore from megaspore mother cell by meiosis
2. It takes place in anther 2. It takes place in ovule of ovary
3. Four functional microspores are produced.
3. Only one functional megasore is produced.
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Embryo sac( FEMALE GAMETOPHYTE)(n)
CHALAZAL END
MICROPYLAR END
(n)
(n)
(n)
(n)
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SELF INCOMPATIBILITY TO PREVENT SELF POLLINATION
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Entry of pollen tube into an ovule
Chalazal end
Micropylar end
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Discharge of gametes into synergids
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TRIPLE FUSION (n+n+n)
SYNGAMY
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Dicot and monocot embryo
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Emasculation-removal of anthers from the flower bud before the dehiscence
of anther
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Bagging-covering of emasculated flowers with a bag
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False fruits of apple and strawberry
thalamusseed