Photosynthesis

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Across
  1. 5. the part of a plant cell that contains chlorophyll and in which photosynthesis occurs.
  2. 6. to change from one form to another.
  3. 7. a simple sugar that is found widely in nature and is an important energy source for plants and animals.
  4. 8. a colorless, odorless, gaseous element that is found in air and water. It is necessary for humans, animals and plants to live.
Down
  1. 1. an organism that uses photosynthesis or some other biological process to create its own food
  2. 2. the green substance in plants that is essential to photosynthesis.
  3. 3. the process green plants use to turn water and carbon dioxide into food using energy from sunlight.
  4. 4. a colorless, odorless gas that is composed of carbon and oxygen. It is absorbed from the air by plants and produced when people and animals breathe out.