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Plant structure adaptations and responses
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What is the result of pollination?

A Fruit: An ovary containing seeds.

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Chapter 25

Chapter 25

Plant

Responses and Adaptations

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Hormone-producing cells

Target

cells

Movement

of hormone

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.

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C. Plant cells will send signals to one another to tell them:

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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Leaf Drop

Fruit

Ripening

Sprouting

Corn Seeds

Cactus

Blooming

Tree Budding

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Ethylene causes Fruit to Ripen

Ethylene causes Fruit to Ripen

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.

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Plant Tropisms

Plant Tropisms

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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Geotropism

What type of tropism is shown in these pictures?

Thigmotrophism

Thigmotrophism

Geotropism

Phototropism

Phototropism

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