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Grade 9 Natural Selection & Adaptation Worksheet with Answers

Grade 9 (US) · Year 10 (UK) · Class 9 (India) · Science

Unit 3: Evolution & ClassificationNatural SelectionNGSS HS-LS4-4

Variation, mutation and natural selection, and how populations change over generations. This free high school worksheet has 11 questions and a full answer key. Print it or save it as a PDF — every answer is checked by code, not guessed.

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Natural Selection & Adaptation

Grade 9 · Science

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Learning goal: Natural Selection · NGSS HS-LS4-4

Directions: Read each question carefully and write your answer on the line.

RememberNatural selection

Variationtraits differToo manyyoungnot all surviveCompetitionfood, spaceBest-suitedsurviveand reproduceTraitsspreadover generations
  1. 1

    What is artificial selection?

  2. 2

    Who developed the theory of evolution by natural selection?

  3. 3

    What is variation?

  4. 4

    What evidence supports evolution?

  5. 5

    Darwin's finches had different beak shapes. Why?

  6. 6

    Why do bacteria become resistant to antibiotics?

  7. 7

    Give an example of artificial selection.

  8. 8

    Peppered moths turned darker during the Industrial Revolution. Why?

  9. 9

    What is a mutation?

  10. 10

    What is natural selection?

  11. 11

    Do individuals evolve during their lifetime?

★ Challenge corner for fast finishers

If you could fold a sheet of paper 42 times, roughly how thick would it be?

How did I do?

Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/science/9/natural_selection

Answer key (click to show)
  1. 1.humans breeding plants or animals for chosen traits
  2. 2.Charles Darwin
  3. 3.differences in traits among individuals of a species
  4. 4.fossils, DNA similarities and similar body structures
  5. 5.beaks adapted to different foods on different islands
  6. 6.resistant bacteria survive and pass on the trait
  7. 7.dog breeds or crop varieties (any one)
  8. 8.dark moths were better hidden on sooty trees and survived more
  9. 9.a change in DNA
  10. 10.individuals with helpful traits survive and reproduce more
  11. 11.no — populations evolve over generations
  12. ★far enough to reach the Moon (about 440,000 km) (challenge corner)

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Guides for teaching Natural Selection & Adaptation

Punnett Squares Step by Step (with Practice Problems)How to set up a monohybrid cross, read genotype and phenotype ratios, and work backwards from offspring to parents.

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