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biology 0610printed 210 · PDF 210
328 pagesrevision 46933
printed 210 · PDF 210
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● Sometimes pollen is carried to the stigma of the same flower or to another
flower on the same plant. This is called self pollination.
● If pollen is taken to a flower on a different plant of the same species. Then it is
called cross pollination.
Fertilisation
● After pollination the male gamete inside the pollen grain is on the stigma.
● Now it has to find its way inside the flower in the ovary in the ovule to the
female gamete.
● The pollen grain begins to grow in a tube. It grows through the style and ovary
towards the ovule.
● It secretes an enzyme to digest a pathway through the style.
● The ovule is surrounded by several protective layers of cells called
integuments. At one end there is a small hole called the micropyle into the