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Photosynthesis - PowerPoint PPT Presentation


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Photosynthesis. What is photosynthesis?. Photosynthesis is the process in which a plant uses energy from the sun to make food for itself. Photo means “light”; synthesis means “to put together”. Therefore, photosynthesis is the process of using light to make food. The Process.

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Presentation Transcript
what is photosynthesis
What is photosynthesis?
  • Photosynthesis is the process in which a plant uses energy from the sun to make food for itself.
  • Photo means “light”; synthesis means “to put together”.
  • Therefore, photosynthesis is the process of using light to make food.
the process
The Process
  • Photosynthesis is a very complicated process.
  • Plants use energy from the sun to convert carbon dioxide and water into oxygen and sugar.
the sun s energy
The Sun’s Energy
  • Plants capture the sun’s energy using its leaves and other green parts of the plant.
  • Plants mainly use leaves because they contain more chloroplasts, which are green organelles inside plant cells.
chloroplasts
Chloroplasts
  • Chloroplasts in plant cells are the source of their green color.
  • The color comes from pigments, which are chemical compounds that absorb light.
  • The main pigment in chloroplasts is chlorophyll.
  • Chloroplasts may contain yellow and orange pigments.
using the energy
Using the energy
  • The plant uses the energy from the sun to produce food.
  • The plant will need two raw ingredients: six water molecules and six carbon dioxide molecules.
  • The water comes from the roots.
  • The carbon dioxide comes from the leaves through the stomata
  • Stomata are tiny openings on the undersides of the leaves.
the photosynthesis equation
The Photosynthesis Equation
  • 6 CO2 + 6 H2O --- light energy --- C6H12O6 + 6 O2
  • Carbon Dioxide + Water >>> Glucose + Oxygen
  • Glucose is used for food.
  • Oxygen is released as a waste.
photosynthesis and life
Photosynthesis and Life
  • The plant is an autotroph, an organism that makes its own food.
  • A caterpillar is eating a leaf, so it gets its energy from the sun in an indirect way.
  • A bird eats the caterpillar, so it gets its energy indirectly from the sun as well.
  • The bird and caterpillar represent heterotrophs, which is an organism that cannot produce it own food.
  • Almost all living things obtain energy directly or indirectly from photosynthesis.
  • Photosynthesis brings oxygen into the air which is essential for many living things.