Photosynthesis - MelissaSimpson

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Transcript Photosynthesis - MelissaSimpson

What is Photosynthesis?
 Photosynthesis is the making of food by plants. The
essential ingredients in making this food are sunlight,
the chlorophyll that is present in green plants, water
and carbon dioxide in the air. Photosynthesis is
necessary not just for plants to make food for
themselves, but for animals, including us eventually.
How does photosynthesis occur?
 Water is taken in through the roots of the plant and
transported to the leaves by the xylem (tubes that
carry water) in the stems
 Carbon dioxide animals breathe out from the air goes
into the leaves through the tiny pores called stomata
and is spreads to the cells that contain chlorophyll in
the inside layer of the leaf.
 Sunlight is used to break down the water in the plant
into oxygen which the plant gives off and we use to
breathe. The hydrogen is then used with the carbon
dioxide to create the food for the plants and ultimately
food for animals as well.
Important Facts about
 Photosynthesis sustains green plants and as a
result all other living things as well. Both directly
and indirectly green plants generate most of the
world’s chemical energy. Wood and fossil fuels —
coal, oil and natural gas formed from plants and
animals that lived millions of years ago — provide
much of our electricity and heat. Green plants are
the source of gasoline that we use to power buses
and cars. Fresh fruits, vegetables and grain, as
well as meat from animals that eat plants, give us
the energy to work and play and think.
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