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Natural selection and resistance

9th grade (Year 10 in England) · 10 questions · Common Core: NGSS.MS-LS4-4, NGSS.HS-LS4-2, NGSS.HS-LS4-4 · England: KS4 Combined Science: Evolution, inheritance and variation

Name

Date

Score/ 10

  1. Question 1

    A population of 200 bacteria contains 5% that are resistant to an antibiotic. The antibiotic kills all the others. How many bacteria survive?

    Answer

  2. Question 2

    What is the original source of new variation in a population?

    • A. learning new skills
    • B. mutations in DNA
    • C. injuries
    • D. exercise

  3. Question 3

    A population of 500 bacteria contains 5% that are resistant to an antibiotic. The antibiotic kills all the others. How many bacteria survive?

    Answer

  4. Question 4

    What is the original source of new variation in a population?

    • A. exercise
    • B. learning new skills
    • C. mutations in DNA
    • D. injuries

  5. Question 5

    A population of 500 bacteria contains 1% that are resistant to an antibiotic. The antibiotic kills all the others. How many bacteria survive?

    Answer

  6. Question 6

    Before the Industrial Revolution most peppered moths were pale. Soot darkened tree bark, and dark moths became common. Why?

    • A. Birds prefer to eat dark moths
    • B. Pale moths painted themselves dark
    • C. Dark moths were better camouflaged, so fewer were eaten by birds
    • D. Soot changed the moths' genes directly

  7. Question 7

    A population of 100 bacteria contains 2% that are resistant to an antibiotic. The antibiotic kills all the others. How many bacteria survive?

    Answer

  8. Question 8

    What is selective breeding?

    • A. feeding animals more food
    • B. animals choosing their own mates in the wild
    • C. cloning one plant
    • D. humans choosing parents with useful characteristics to breed

  9. Question 9

    A population of 100 bacteria contains 2% that are resistant to an antibiotic. The antibiotic kills all the others. How many bacteria survive?

    Answer

  10. Question 10

    Before the Industrial Revolution most peppered moths were pale. Soot darkened tree bark, and dark moths became common. Why?

    • A. Pale moths painted themselves dark
    • B. Soot changed the moths' genes directly
    • C. Dark moths were better camouflaged, so fewer were eaten by birds
    • D. Birds prefer to eat dark moths

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Answer key: Natural selection and resistance

  1. 1. 10

  2. 2. B. mutations in DNA

  3. 3. 25

  4. 4. C. mutations in DNA

  5. 5. 5

  6. 6. C. Dark moths were better camouflaged, so fewer were eaten by birds

  7. 7. 2

  8. 8. D. humans choosing parents with useful characteristics to breed

  9. 9. 2

  10. 10. C. Dark moths were better camouflaged, so fewer were eaten by birds