Cycles in Living Things Crossword Puzzle

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Across
  1. 3. A heterotrophic organism that feeds on other organisms in a food chain.
  2. 4. What gives leafy greens and blue green algae their green color.
  3. 6. An organism capable of synthesizing its own food from inorganic substances using light or chemical energy.
  4. 7. nitrogen A nonmetallic element that constitutes nearly four-fifths of the air by volume, occurring as a colorless, odorless, almost inert diatomic gas, N2.
  5. 9. The process by which a green plant turns water and carbon dioxide into food when the plant is exposed to light.
  6. 11. An organelle in the cytoplasm of cells that functions in energy production.
  7. 14. Any substance whose presence in plant or animal tissues produces a characteristic color.
  8. 15. The process in which energy is emitted as particles or waves.
  9. 18. 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.
  10. 19. A colorless syrupy organic acid formed in sour milk and produced in the muscle tissues during strenuous exercise.
  11. 20. 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.
  12. 21. The protection of plants, animals, and natural areas from the damaging effects of human activity.
Down
  1. 1. A single-celled fungus that ferments sugar to produce alcohol and carbon dioxide.
  2. 2. 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.
  3. 5. Living or occurring in the absence of free oxygen.
  4. 8. Process by which free nitrogen (N2) is extracted from the atmosphere and converted (fixed) into nitrogen compounds which are plant nutrients (fertilizer).
  5. 10. An organism, usually a bacterium or fungus, that breaks down the cells of dead plants and animals into simpler substances.
  6. 12. An autotrophic organism that serves as a source of food for other organisms in a food chain.
  7. 13. A metabolic process that converts sugar to acids, gases or alcohol.
  8. 16. A chemical substance that is present at the start of a chemical reaction.
  9. 17. Anything that is produced, whether as the result of generation, growth, labor, or thought, or by the operation of involuntary causes.
  10. 22. Living or occurring only in the presence of free oxygen.