1 Reproduction Sexual Reproduction in Flowering Plants OB 52-58.
4.5 Reproduction in Flowering Plants
Transcript of 4.5 Reproduction in Flowering Plants
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4.5 Sexual
Reproduction In
Flowering Plants
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MALE & FEMALE
STRUCTURE IN A FLOWER
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Formation of pollen grain
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Formation of pollen grains
• Pollen grains male gametes
• Pro!"#e! in t$e anther
• Ant$er $as eit$er % or lo'e (!epen! on
spe#ies)
• Ea#$ lo'e $as pollen sac
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Formation of pollen grains
• Pollen sa# #ontains $"n!re!s of !iploi!
pollen mother cells
• Tapet"m
* A la+er of #ells s"rro"n!ing t$e pollen mot$er
#ells
* So"r#e of reser,e foo! for t$e pollen sa#
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Pollen Sa#
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Megaspore tetra!s
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One #elle! mi#rospore
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Mat"re pollen grain
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-e,elopment of t$e em'r+o
sa# in t$e o,"le
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-e,elopment of t$e em'r+o sa#
in t$e o,"le• Em'r+o sa#
* -e,elopment 'egins at t$e #entre of t$e o,"le
* .as $aploi! female gamete #ells
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Fo"r megaspores
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Immat"re female gametop$+te
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Em'r+o sa#
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Formation of t$e pollen t"'e
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Formation of pollen t"'e
• W$en pollen grains
rea#$es t$e stigma
(pollination)/ s"gar int$e stigma stim"late it
to germinate & form
pollen t"'e
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Pollen grain 0it$ pollen t"'e
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-o"'le fertilisation
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-o"'le fertili1ation
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-e,elopment of see! & fr"it
after fertilisation
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