Quiz: Ecosystems and Biological Evolution

Quiz · Grade 11 · Science · ngss

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Questions

• Q1. A grassland ecosystem experiences a severe drought. A student claims the drought caused individual grasses to develop deeper roots. Which evaluation of this claim is most scientifically accurate?

  • Incorrect; plants with existing deeper roots survived and reproduced more
  • Correct; plants grow deeper roots because they need more water
  • Correct; drought stress directly changes the genes of each plant
  • Incorrect; drought never affects which traits are common in populations

  Answer: Incorrect; plants with existing deeper roots survived and reproduced more

• Q2. Two forest ecosystems face the same new fungal disease. Forest A has high tree species diversity; Forest B is a single-species plantation. Which prediction is best supported by evidence about biodiversity?

  • Forest A is more likely to maintain ecosystem function
  • Forest B is more likely to recover because trees are identical
  • Both forests will respond identically since the disease is the same
  • Forest B will adapt faster because it has more individuals

  Answer: Forest A is more likely to maintain ecosystem function

• Q3. Sample data from a model island: beetle color frequency before and after a predatory bird arrived.

  Color	Before (%)	After 20 generations (%)
  Green	30	75
  Brown	70	25

  Which conclusion is best justified?

  • Birds likely preyed more on brown beetles, favoring green beetles
  • Brown beetles turned green to avoid being eaten by birds
  • Green beetles reproduced more because green is a dominant allele
  • Random chance alone fully explains the shift in color frequency

  Answer: Birds likely preyed more on brown beetles, favoring green beetles

Grade

• 11

Subject

• Science

Standards

• Code: HS-LS4
• Framework: ngss

Answer Key

• Answer: Incorrect; plants with existing deeper roots survived and reproduced more
• Number: 1

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