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Life%20Support%20for%20Plants

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Carbon dioxide is one of the two main materials plants use to make food. ... Desert plants have thick stems that can store water for long periods; also have ... – PowerPoint PPT presentation

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Title: Life%20Support%20for%20Plants


1
Life Support for Plants
  • A72-75

2
Basic Needs of Plants
  • Air
  • Nutrients
  • Water
  • Soil

3
Why do plants need air?
  • There is carbon dioxide in the air. Leaves take
    in this carbon dioxide.
  • Carbon dioxide is one of the two main materials
    plants use to make food.

4
Why do plants need nutrients?
  • Just as animals need nutrients (vitamins and
    minerals) for growth, so do plants.
  • Soil provides plants with the nutrients they need
    to survive.
  • Plants cannot survive in soil that doesnt have
    the necessary nutrients.

5
What about water?
  • Plants get water from rain.
  • Some of the water is absorbed through the plant
    leaves.
  • Most is absorbed by the roots.

6
Necessary Light
  • No plant can live in total darkness.
  • Some plants, however, may grow better in shaded
    areas.

7
Photosynthesis
  • Scientific name for the process by which a plant
    makes its own food
  • Photo means Light
  • Synthesis means Putting Together
  • Plants make food from light energy combined with
    carbon dioxide and water.

8
How does photosynthesis work?
  • Light Carbon Dioxide Water
  • Light is trapped by the chlorophyll.
  • Leaves take in carbon dioxide.
  • Roots take in water.
  • Water travels to leaves.
  • In the leaves, sugar is formed.
  • Oxygen is then released into the air by the
    leaves.

9
Plant Adaptations
  • Water plants grow from soil below the water, with
    stems growing toward surface
  • Vines grow on forest floors, but have stems
    climbing and clinging to other plants or objects
    for support and to get sunlight
  • Desert plants have thick stems that can store
    water for long periods also have roots near
    surface, to absorb water quickly
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