Page 2 - 2.Lesson Notes -Sexual mode of reproduction II
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Self Pollination Cross Pollination
When pollen grains from a flower reach When pollen grains from a flower reach
the stigma of the same flower or another the stigma of a flower of another plant of
flower on the same plant, It is called self the same kind, it is called cross
Pollination. pollination.
Self pollination can occur only in bisexual Cross pollination can occur both in
flowers. unisexual and Bisexual flowers.
Agents of pollination
For carrying out cross-pollination, some external agents are required for
transferring the pollens from one flower to another.
The natural agents such as birds, insects, animals, wind and water help in
transferring the pollen. They are called Pollinating agents.
(i) Insects- Insects feed on the nectar of flower.
They get attracted to the colour and odour of flowers.
When they sit on such flowers, pollen grains released from anthers
stick to their body and get carried away to some other flower where
they get deposited and help in cross pollination.
Some examples are -bees and butterflies
