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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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