Download Pollination, Fertilization and Fruit Formation

Pollination, Fertilization and Fruit Formation
In Flowering Plants
Some guide questions:
What is pollination?
• How does pollination occur?
• Why is pollination important?
• How is self-pollination different from crosspollination?
• What are the agents of pollination? What is
their important role in pollination?
• What are the advantages and disadvantages
of self and cross pollination?
• Explain how fertilization happens.
• How are fruits and seeds formed?
•
Pollination, Fertilization and Fruit Formation
In Flowering Plants…
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Pollination, Fertilization and Fruit Formation
Pollination, Fertilization and Fruit Formation
In Flowering Plants
In Flowering Plants
What is pollination?
•
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Self Pollination
Transfer of pollen from the anther to the stigma
of a flower
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•
Transfer of pollen from the anther to the stigma
of the same flower
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Pollination, Fertilization and Fruit Formation
Pollination, Fertilization and Fruit Formation
In Flowering Plants
In Flowering Plants
Cross Pollination
•
Agents of Pollination
Transfer of pollen from the anther of one flower
to the stigma of the another flower in the same
plant or to another plant of the same species
Cross pollination is DOES NOT refer to the pollination of 2 completely
different species of plants
Nectar Feeding Insects
• Pollens will stick to them and carried to
another flower
• Wind
• Carries very small pollens from one flower to
another
• Water
• Washes away the pollens to the other flower
• Humans and Animals
• Some pollens may stick to our clothes of hair
of animals
•
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Pollination, Fertilization and Fruit Formation
Pollination, Fertilization and Fruit Formation
In Flowering Plants
In Flowering Plants
Fertilization
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Steps in fertilization…
Occurs when a sperm from the pollen tube
unites with the egg cell in the ovule
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Pollen grains land on the stigma
Each pollen produces a tube called pollen tube
that grows down the stigma through the style
to the ovary
• A male reproductive cell fuses with the egg cell
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Pollination, Fertilization and Fruit Formation
In Flowering Plants
After fertilization comes fruit formation
Most of the parts of the flower with wither and
drop, except for the ovary
• The ovules in the ovary start to develop into
seeds
• Ovary enlarges and becomes a fruit
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