What is the result of pollination?
A Fruit: An ovary containing seeds.
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Hormone Action on Plants
A. Plant cells can produce hormones: which are chemical messengers that travel throughout the plant causing other cells called target cells to respond.
B. In plants, hormones control:
Plant growth & development
Plant responses to environment
Cells in one blooming flower signals other blooms using hormones to open.
C. Plant cells will send signals to one another to tell them:
When trees to drop their leaves.
When to start new growth.
When to cause fruit to ripen.
When to cause flowers to bloom.
When to cause seeds to sprout.
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Fruit tissues release a small amount of ethlyene
Causes fruits to ripen.
As fruit become ripe, they produce more and more ethlyene, accelerating the ripening process.
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Ethylene released by apples and tomatoes causes fruit to age quickly.
1. Tropism: the way a plant grows in response to stimuli in the environment.
Phototropism: growth response to light
-Plants bend towards light
Geotrophism: growth response to gravity
-plant roots grow down with gravity, shoots (stems) grow up against gravity and out of the soil.
Thigmotropism: growth response to touch
-vines grow up around trees, venus flytrap closes when leaves are touched
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