Cycles in Living Things Crossword Puzzle

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Across
  1. 2. What gives leafy greens and blue green algae their green color.
  2. 5. An organism, usually a bacterium or fungus, that breaks down the cells of dead plants and animals into simpler substances.
  3. 7. The process by which a green plant turns water and carbon dioxide into food when the plant is exposed to light.
  4. 11. A heterotrophic organism that feeds on other organisms in a food chain.
  5. 12. The combined processes, including photosynthesis, decomposition, and respiration, by which carbon as a component of various compounds cycles between its major reservoirs—the atmosphere, oceans, and living organisms.
  6. 13. Living or occurring in the absence of free oxygen.
  7. 14. Any substance whose presence in plant or animal tissues produces a characteristic color.
  8. 16. A nonmetallic element that constitutes nearly four-fifths of the air by volume, occurring as a colorless, odorless, almost inert diatomic gas, N2.
  9. 17. Living or occurring only in the presence of free oxygen.
  10. 18. A colorless syrupy organic acid formed in sour milk and produced in the muscle tissues during strenuous exercise.
  11. 20. Process by which free nitrogen (N2) is extracted from the atmosphere and converted (fixed) into nitrogen compounds which are plant nutrients (fertilizer).
  12. 21. A chemical substance that is present at the start of a chemical reaction.
  13. 22. An autotrophic organism that serves as a source of food for other organisms in a food chain.
Down
  1. 1. The protection of plants, animals, and natural areas from the damaging effects of human activity.
  2. 3. The process in which energy is emitted as particles or waves.
  3. 4. Anything that is produced, whether as the result of generation, growth, labor, or thought, or by the operation of involuntary causes.
  4. 6. The set of metabolic reactions and processes that take place in the cells of organisms to convert biochemical energy from nutrients into adenosine triphosphate (ATP), and then release waste products.
  5. 8. An organelle in the cytoplasm of cells that functions in energy production.
  6. 9. A metabolic process that converts sugar to acids, gases or alcohol.
  7. 10. A single-celled fungus that ferments sugar to produce alcohol and carbon dioxide.
  8. 15. An organism that cannot manufacture its own food and instead obtains its food and energy by taking in organic substances, usually plant or animal matter.
  9. 19. An organism capable of synthesizing its own food from inorganic substances using light or chemical energy.