How Are Plants and Animals Different?

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Photosynthesis and Respiration
4th Grade Science
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How Are Plants and Animals Different?

• Plants can make their own food.

• Animals cannot make their own food.

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Its question time!
What is the process by which plants make food?
Photosynthesis
Photosynthesis is the process by which plants
make food. A green plant makes food using light
energy. Green plants get light energy from the
sun.
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What part of the plant produces food?
Here comes a hint!
In most plants the leaves are the special parts
where the most food is made.
Leaves contain a chemical called chlorophyll.
Chlorophyll is the green matter in plants that
traps light energy to produce food.
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Plants use water and carbon dioxide to make food.
Water is taken from the soil by the roots and
travels up the stems to the leaves. Carbon
dioxide is taken from the air. Air enters the
plant through small openings (stomata) in leaves.
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STOMATA
Tiny openings on the underside of the leaf.
Stomata is similar to a human nose. Stomata
breathes in carbon dioxide and breathes out
oxygen. The human nose breathes in oxygen and
breathes out carbon dioxide.
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Plants store extra food in the forms of sugar and
starch.
Sugar sweet grapes
Starch corn
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Pop quiz!
Why is energy needed by plants and animals?
Energy is needed for growth, repair of tissues,
movement, warmth, and all other body functions.
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ALL LIVING THINGS NEED ENERGY!
All living things need energy. Energy comes from
food made by plants. Oxygen combines with food
and energy is released.
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Once again
PHOTOSYNTHESIS is the process by which green
plants get light energy from the sun. This energy
is collected in the plant leaves as
chlorophyll. Chlorophyll helps the plant produce
food along with water and carbon dioxide.