Gas Exchange In Animals & Plants

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Across
  1. 3. The process of taking in oxygen and releasing carbon dioxide in both plants and animals.
  2. 5. A protein in red blood cells that carries oxygen.
  3. 6. A waste gas produced by respiration and used by plants in photosynthesis.
  4. 8. Organelles in plant cells where photosynthesis takes place.
  5. 9. A gas that is essential for aerobic respiration.
  6. 10. The movement of molecules from an area of higher concentration to an area of lower concentration.
  7. 11. Tiny air sacs in the lungs where gas exchange occurs.
  8. 12. Small blood vessels where gas exchange occurs in animals.
Down
  1. 1. The windpipe that connects the larynx to the lungs in animals.
  2. 2. The process by which plants use sunlight to synthesize foods from carbon dioxide and water.
  3. 4. Respiratory organs found in many aquatic organisms that extract oxygen from water.
  4. 7. Pores on the surface of leaves that allow gas exchange.