BC Science 10 Chapter 2

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CatTheStripes
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273193
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BC Science 10 Chapter 2
Updated:
2014-05-08 15:50:56
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BCScience10
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science
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Chapter 2
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  1. Biodegradation means?
    The break down of dead organic matter
  2. Consumers means?
    An organism that eats other organisms
  3. Decomposers means?
    Organisms that break down waste or dead organisms and change them into nutrients
  4. Food chain means?
    Flow of energy from plant to animal and animal to animal
  5. Food pyramid means?
    The loss of energy from each trophic level to the next
  6. Food web means?
    The feeding relationships within an ecosystem
  7. Producers mean?
    Organisms that produce carbohydrates during photosynthesis
  8. Trophic level means?
    Steps in a food chain that show feeding and niche relationships
  9. Cellular respiration means?
    The process of releasing carbon dioxide into the atmosphere
  10. Denitrification means?
    When nitrogen is returned to the atmosphere
  11. Nitrification mean?
    The process of turning ammonium into nitrate
  12. Photosynthesis means?
    When carbon dioxide enters the leaves of plants and reacts with water to make carbohydrates and oxygen
  13. Sedimentation means?
    When soil and decaying organic matter accumulate in layers to make sedimentary rock
  14. Weathering means?
    When rocks are broken down into smaller fragments
  15. Bioaccumulation means?
    The gradual build up of synthetic and organic chemicals
  16. Bioremediation means?
    The use of organisms to break down chemical pollutants
  17. Heavy metals mean?
    Metallic elements with high density's
  18. Keystone species means?
    Species that greatly affect population numbers and health of an ecosystem
  19. Parts per million (ppm) means?
    A measurement of chemical accumulation; 1 ppm means 1 particle mixed with 999 999 other particules
  20. PCB's (polychlorinated biphenyls) means?
    Synthetic chemicals containing chlorine used to make plastics and other industrial products
  21. What is biomass?
    Total of living plants, animals, fungi, and bacteria in anarea
  22. Why are plants called producers?
    They "produce" food during photosynthesis, in the form of carbohyrates
  23. What role do herbivores have in a food pyramid?
    The more herbivores, the more carnivores that can be supported
  24. What happens to the food energy taken in by an organism?
    Supports cellular respiration, growth, reproduction, waste matter, and death
  25. How much energy is lost from producers to secondary consumers?
    99% energy lost
  26. What is the main difference between food chain and food webs?
    Webs showing feeding relationship and chains show energy
  27. Why do you not gain weight every time you eat?
    Food is turned to energy
  28. What is a nutrient store?
    Accumulation of nutrients in the atmosphere, ocean, and land masses
  29. How can human activities affect a nitrogen cycle?
    Increase of nutrients before they can be replenished
  30. Where is carbon stored on earth?
    Land vegetation, ocean plants,land and ocean animals, atmosphere, coal deposits, and oil and gas deposit's
  31. What human activities have an affect on the carbon cycle?
    Driving vehicles, urban expansions, an burning fossil fuels
  32. What is nitrogen fixation?
    The process of nitrogen gas being converted into compounds containing nitrate or ammonium
  33. Where does nitrogen fixation take place?
    In the atmosphere, soil, and in water bodies
  34. What human activities contribute excess nitrogen into ecosystems?
    Power plants, sewage treatment, clearing forests, and burning grasslands
  35. What is acid precipitation?
    Dissolved nitrogen compounds in clouds fall back to earth as rain
  36. What is eutrophication?
    When excess nitrogen result in increased plant production and decay
  37. How is phosphorus stored in ecosystems?
    As phosphate in phosphate rocks and sediments on the ocean floor
  38. What human activities contribute to excess phosphate in ecosystems?
    Mining and treated sewage
  39. In what form is carbon stored in the ocean?
    In its dissolved form or carbon dioxide
  40. How can lightning benefit an ecosystem?
    Fixing the nitrogen in the atmosphere
  41. How does a chemical bio accumulate in an organism?
    Going into the fats
  42. What are Persistent Organic Pollutants?
    Carbon containing compounds
  43. In the past, how was lead introduced to ecosystems?
    Insecticides, paint, gasoline, batteries, and electronics
  44. How does Cadmium enter the environment?
    Rock weathering, volcanoes, and forest fires
  45. What are some natural sources of mercury?
    Volcanoes, geothermal springs, and rock weathering
  46. Why are amphibians disappearing?
    Prolonged drought, ultraviolet radiation, habitat loss, pollution, over hunting, parasites, and disease caused by viruses and fungi
  47. What effect does DDT have on humans?
    On our blood from mosquitoes with disease, and from the food we eat
  48. What are three health effects of methylmercury?
    Affects nerve cells, the heart, kidneys, lungs, and suppresses the immune system

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