Biology Vocab Crossword Unit 4

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Across
  1. 5. A chemical substance that an organism needs to sustain life
  2. 10. A network of complex interactions formed by the feeding relationships among the various organisms in an ecosystem
  3. 13. The process by which bacteria converts nitrates into nitrogen gas
  4. 15. A process used by plants and other autotrophs to capture light energy and use it to power chemical reactions that convert carbon dioxide and water into oxygen and energy-rich carbohydrates such as sugars and starches
  5. 16. A material made up of decaying bits of plant and animal material
Down
  1. 1. An organism that relies on other organisms for its energy and food supply; also called a heterotroph
  2. 2. A process of converting nitrogen gas into nitrogen compounds that plants can absorb and use
  3. 3. First producer of energy-rich compounds that are later used by other organisms
  4. 4. A model of the relative amounts of energy or matter contained within each trophic level in a given food chain or food web
  5. 6. An organism that is able to capture energy from sunlight or chemicals and use it to produce its own food from inorganic compounds; also called a producer
  6. 7. A series of steps in an ecosystem in which organisms transfer energy by eating and being eaten
  7. 8. The total amount of living tissue within a given trophic level
  8. 9. An organism that obtains food by consuming other living things; also called consumers
  9. 11. The process in which elements, chemical compounds, and other forms of matter are passed from one part of the biosphere to another
  10. 12. A process in which chemical energy is used to produce carbohydrates
  11. 14. Each step in a food chain or food web