Leaf Structure

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Leaf Structure

• Where in the leaf does photosynthesis take place?

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Stomata

• What comes out of the stomata?
• What regulates the opening of the stomata?

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Primary vs. Secondary Growth

• Primary growth increases the plants length.
• Secondary growth increases width.

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Roots

• Fibrous roots
• Taproots

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SEEDS
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Plants are living things.They respond to the
environment

• This is called TROPISMS

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PHOTOTROPISM

• A plant grows toward a light source.
• This response it quick so that new seedlings grow
  toward the sun in order to survive.

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Thigmotropism

• The plants response to TOUCH.
• This is why vines grow around objects.

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GRAVITROPISM or GEOTROPISM

• The roots of plants grow with gravity.

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Aquatic Plants

• Water plants have air filled sacs in which oxygen
  can diffuse

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Desert Plants

• These plants have extensive root systems,
• reduced leaves (thorns),
• and thick stems that
• can store water.

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Carnivorous Plants

• These plants live in areas with poor soil. The
  insects provide the nutrients that the plant is
  not getting from the soil.

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Plant Hormones

• Cytokinins stimulate cell division and growth.
• Cytokinins stimulate dormant seeds to sprout.

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Ethylene

• Ethylene is a plant hormone that stimulates fruit
  to ripen.

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