CHAPTER 2 PPTSEXUAL REPRODUCTION IN
FLOWERING PLANTSPREPARED BY ASHA GOPALAKRISHNA
L.S OF A FLOWER
L.S.OF A FLOWER
Three dimensional cut section of an anther
Anther- T.S young and mature dehisced
T.S of anther young and mature
MicrosporogenesisPMC (2n) MICROSPORE(n)
MEIOSIS
Pollen grain tetrad
POLLEN GRAINS
Stages of microspore maturing into a pollen grain
Pollen grains-rich in nutrients
Diagrammatic view of anatropous ovule
MEGASPOROGENESISMMC(2n) MEGASPORE(n)
MEIOSIS
Megasporogenesis
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.
Embryo sac( FEMALE GAMETOPHYTE)(n)
CHALAZAL END
MICROPYLAR END
(n)
(n)
(n)
(n)
SELF INCOMPATIBILITY TO PREVENT SELF POLLINATION
Entry of pollen tube into an ovule
Chalazal end
Micropylar end
Discharge of gametes into synergids
TRIPLE FUSION (n+n+n)
SYNGAMY
Dicot and monocot embryo
Emasculation-removal of anthers from the flower bud before the dehiscence
of anther
Bagging-covering of emasculated flowers with a bag
False fruits of apple and strawberry
thalamusseed
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