Quiz  /  Machine Dynamics Class 12 MCQ Questions With Answers

  • 1. 
    What 2 factors decrease population size?

  • Immigration, Births
  • Emigration, Births
  • Emigration, Deaths
  • Immigration, Deaths

  • 2. 
    Which of the following is a density-independent limiting factor?

  • natural disaster
  • predation
  • disease
  • parasitism

  • 3. 
    The way in which individuals of a population are spread out is called

  • population density
  • survivorship
  • population dispersion
  • logistic curve

  • 4. 
    What type of population growth is shown in the graph?

  • logistic growth
  • logical growth
  • exponential growth
  • density-dependent growth

  • 5. 
    Secondary succession is most likely to occur

  • on a volcanic island
  • after a rainstorm
  • after a Thanksgiving Turkey dinner
  • after a forest fire

  • 6. 
    What is the name for this leveling off shown in the graph?

  • logistic line
  • carrying capacity
  • climax point
  • mediocre

  • 7. 
    To measure population density, you must divide the number of individuals living in a defined space by the

  • area of the space
  • birth and death rates
  • carrying capacity
  • height of the space

  • 8. 
    The movement of a single caribou into a herd is an example of

  • population
  • immigration
  • emigration
  • predation

  • 9. 
    Diseases may spread more rapidly when an area is crowded, so disease is considered to be a

  • type I survivorship curve
  • population crasher
  • density-dependent limiting factor
  • population enhancer

  • 10. 
    Which of the following statements about primary succession is true?

  • It begins with a climax community
  • Small mammals are the first to live there
  • It begins with bare rock
  • It begins with rock and soil

  • 11. 
    Nesting birds often space themselves evenly from other nests. This pattern is called

  • clumped dispersion.
  • uniform dispersion.
  • random dispersion
  • scatter dispersion

  • 12. 
    At what amount of yeast does the population in Figure 14.3 level off?

  • 3.0 mg/cc
  • 1.5 mg/cc
  • 6.0 mg/cc
  • 4.5 mg/cc

  • 13. 
    Which of the following is a density-dependent limiting factor?

  • human activities
  • unusual weather
  • competition
  • natural disaster

  • 14. 
    A sequence of biotic changes that regenerate or create an ecological community is known as

  • factors
  • erosion
  • succession
  • progression

  • 15. 
    What type of growth is shown on this graph?

  • logistic
  • exponential
  • average
  • density-independent

  • 16. 
    What pattern of growth will a population with limited resources show?

  • density-dependent
  • exponential
  • logistic
  • logical

  • 17. 
    What is the amount of yeast shown in the graph at the 6-hour mark?

  • 6.0 mg/cc
  • 3.0 mg/cc
  • 1.5 mg/cc
  • 10 mg/cc

  • 18. 
    Lichens and mosses that first live in uninhabited areas are examples of

  • secondary species
  • non-native species
  • pioneer species
  • climax species

  • 19. 
    Which of the following will increase the size of a population?

  • emigration and births
  • immigration and deaths
  • immigration and births
  • emigration and deaths

  • 20. 
    After how many hours does the yeast population shown in the graph reach its carrying capacity?

  • 15 hours
  • 10 hours
  • 6 hours
  • At the start
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