IB Biology Chapter 4: Ecology

40 Questions

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IB Biology Chapter 4: Ecology

4. 1 Species, communities and ecosystems 4. 2 Energy flow 4. 3 Carbon cycling 4. 4 Climate change


Questions and Answers
  • 1. 
    • A. 

      Species are groups of organisms that can potentially interbreed to produce fertile offspring

    • B. 

      Species are a population that can potentially interbreed to produce fertile offspring

    • C. 

      Species are groups of organisms that can potentially interbreed to produce offspring

    • D. 

      Species are a group of the same organism that can produce offspring

  • 2. 
    • A. 

      A population is a group of species who live in the same area

    • B. 

      A population is a group of organisms of the same species who live in the same area at the same time

    • C. 

      A population is a group of species who live at the same time

    • D. 

      A population is a group of organisms of the same species

  • 3. 
    Organisms that make their own carbon compounds from carbon dioxide and other simple substances are: 
  • 4. 
    Some unicellular organisms use both methods of nutrition.
    • A. 

      True

    • B. 

      False

  • 5. 
    Consumers are heterotrophs that feed on living organisms by: 
  • 6. 
    Unicellular consumers take the food in by ____ and digest it inside vacuoles.Multicellular consumers take food into their ____ by swallowing it.
    • A. 

      Exocytosis, digestive system

    • B. 

      Digestive system; endocytosis

    • C. 

      Endocytosis; digestive system

    • D. 

      Endocytosis; stomach

  • 7. 
    Detrivores digest dead organic matter and then ingest it internally and absorb the products of ingestion.
    • A. 

      True

    • B. 

      False

  • 8. 
    Saprotrophs are ____ that obtain organic nutrients from ____ by ____ digestion (check multiple boxes)
    • A. 

      Heterotrophs

    • B. 

      Autotrophs

    • C. 

      Dead organic matter

    • D. 

      Internal

    • E. 

      External

    • F. 

      Living organisms

  • 9. 
    • A. 

      A community is formed by populations of different species living together and interacting with each other

    • B. 

      A community is formed by populations of the same species living together and interacting with each other

    • C. 

      A community is formed by populations of different species living in different areas

    • D. 

      A community is formed by populations of different biotic and abiotic factors

  • 10. 
    When the null hypothesis is rejected, it automatically means the alternative hypothesis is true
    • A. 

      True

    • B. 

      False

  • 11. 
    • A. 

      All the living organisms and abiotic factors that do not interact with each other

    • B. 

      The abiotic environment in an area

    • C. 

      The community of organisms in an area

    • D. 

      The community of organisms in an area and their non-living environment

  • 12. 
    Living organisms need a supply of chemical elements
    • A. 

      True

    • B. 

      False

  • 13. 
    What are the three requirements for sustainability in ecosystems?
    • A. 

      Nutrient availability

    • B. 

      Chemicals

    • C. 

      Living organisms

    • D. 

      Detoxification of waste products

    • E. 

      Energy availability

    • F. 

      Water supply

  • 14. 
    Light energy is converted to chemical energy in carbon compounds by:
    • A. 

      Photosynthesis

    • B. 

      Heterotrophs

    • C. 

      Consumers

    • D. 

      Sunlight

  • 15. 
    Producers can release energy by:
    • A. 

      Photosynthetic pigments

    • B. 

      Cell respiration

    • C. 

      Sunlight

    • D. 

      Chemical compounds

  • 16. 
    • A. 

      A diagram that shows energy produced

    • B. 

      A diagram that shows producers and consumers

    • C. 

      A sequence of organisms, each of which feeds on the previous one.

    • D. 

      A sequence of organisms, each of which feeds on the following one.

  • 17. 
    Oxidation reactions are ____ and the energy released is used in ____ reactions to make ATP
    • A. 

      Exothermic; endothermic

    • B. 

      Endothermic; exothermic

    • C. 

      Endothermic; endothermic

    • D. 

      Exothermic; chemical

  • 18. 
    Living organisms cannot convert heat to other forms of energy
    • A. 

      True

    • B. 

      False

  • 19. 
    Autotrophs absorb carbon dioxide from the atmosphere. This ____ the carbon dioxide concentration of the atmosphere.
  • 20. 
    Carbon dioxide is soluble in water. It can form:
    • A. 

      Hydrogen H+

    • B. 

      Carbonic acid H2CO3

    • C. 

      Carbon dioxide CO2

    • D. 

      Carbonate CO3 2-

  • 21. 
    What cells carry out aerobic cell respiration? (multiple answers correct)
    • A. 

      Saprotrophs

    • B. 

      Non-photosynthetic cells in producers

    • C. 

      Animal cells

  • 22. 
    Archaeans carry out methanogenesis in ____ environments.
  • 23. 
    Peat forms when organic matter is _____ because of anaerobic conditions in waterlogged soils.
  • 24. 
    The products of complete combustion are:(multiple answers correct)
    • A. 

      Carbon dioxide

    • B. 

      Water

    • C. 

      Methane

    • D. 

      Oxygen

  • 25. 
    Limestone rock is formed of:
  • 26. 
    What is a pool?
    • A. 

      A reserve of the element. It can only be organic.

    • B. 

      A reserve of the element. It can only be inorganic.

    • C. 

      A reserve of the element. It can be organic or inorganic.

    • D. 

      The transfer of the element from one pool to another.

  • 27. 
    Carbon dioxide affects:(multiple answers correct)
    • A. 

      The pH of water

    • B. 

      Photosynthesis rates

    • C. 

      The concentration of other greenhouse gases

    • D. 

      Radiation from the sun

  • 28. 
    The concentration of a gas depends on:
    • A. 

      The rate at which it is released into the atmosphere and how much it is affected by other gases

    • B. 

      The rate at which it is released into the atmosphere

    • C. 

      How long on average it remains in the atmosphere

    • D. 

      The rate at which it is released into the atmosphere and how long on average it remains there.

  • 29. 
    If the concentration of any of the greenhouse gases in the atmosphere changes, we can expect the size of its contribution the the greenhouse effect to change and global temperatures to rise or fall.
    • A. 

      True

    • B. 

      False

  • 30. 
    • A. 

      Greenhouse gases in general

    • B. 

      Industrialisation

    • C. 

      Burning fossil fuels

    • D. 

      Population change

  • 31. 
    If carbonate ion concentrations drop it is ____ for reef-building corals to absorb them to make their skeletons.
  • 32. 
  • 33. 
    Evaluate the claim that human activities are not causing climate change.
  • 34. 
    Name at least two aspects of climate that are influenced by an increase in global temperatures.
  • 35. 
    Explain how global warming occurs.
  • 36. 
    State how water vapour is formed and removed from the atmosphere.
  • 37. 
  • 38. 
    Explain why atmospheric concentrations of methane are not high.
  • 39. 
  • 40. 
    Name at least three forms of descriptive statistics[Blank] [Blank].