Biology – Cambridge IGCSE: Variation and Selection
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Question 1 of 20
1. Question
1 point(s)Some disease-causing bacteria survive treatment with an antibiotic.
Which statement about the surviving bacteria is correct?CorrectIncorrect -
Question 2 of 20
2. Question
1 point(s)The number of bacteria resistant to antibiotics is increasing.
What has contributed to this situation?CorrectIncorrect -
Question 3 of 20
3. Question
1 point(s)Which feature is an example of discontinuous variation?
CorrectIncorrect -
Question 4 of 20
4. Question
1 point(s)Which row best describes human blood groups?
affected by
environmenthas no
intermediate
phenotypesshows
continuous
variationshows
discontinuous
variationA ✓ x ✓ x B ✓ x x ✓ C x ✓ ✓ x D x ✓ x ✓ CorrectIncorrect -
Question 5 of 20
5. Question
1 point(s)Which statement describes the relationship between evolution and natural selection?
CorrectIncorrect -
Question 6 of 20
6. Question
1 point(s)Which statement about blood groups in humans is correct?
CorrectIncorrect -
Question 7 of 20
7. Question
1 point(s)Plants are adapted to survive in different environments.
Which are features of xerophytes?cuticle number
of stomataA thick few B thick many C thin few D thin many CorrectIncorrect -
Question 8 of 20
8. Question
1 point(s)Which statement describes how a species becomes adapted to its environment?
CorrectIncorrect -
Question 9 of 20
9. Question
1 point(s)When antibiotics are overused they become less effective.
Which statement is correct?CorrectIncorrect -
Question 10 of 20
10. Question
1 point(s)These events may happen when an antibiotic is used to treat a bacterial infection.
- The antibiotic kills most of the bacteria.
- The antibiotic resistant bacteria reproduce.
- The antibiotic resistant bacteria survive.
- Some bacteria mutate and are resistant to the antibiotic.
Which sequence may produce a strain of antibiotic resistant bacteria?
CorrectIncorrect -
Question 11 of 20
11. Question
1 point(s)How do the leaves of hydrophytes differ from those of xerophytes?
CorrectIncorrect -
Question 12 of 20
12. Question
1 point(s)The phenotype of an organism is its
CorrectIncorrect -
Question 13 of 20
13. Question
1 point(s)Which is an adaptive feature of hydrophytes?
CorrectIncorrect -
Question 14 of 20
14. Question
1 point(s)What makes tongue rolling an example of discontinuous variation?
CorrectIncorrect -
Question 15 of 20
15. Question
1 point(s)The distribution of the sickle-cell allele in human populations varies in different areas of the world.
What is an explanation for this difference?CorrectIncorrect -
Question 16 of 20
16. Question
1 point(s)When growing millet, farmers choose seeds from high-yielding plants.
Which biological practice is this an example of?CorrectIncorrect -
Question 17 of 20
17. Question
1 point(s)Which graph shows the growth of a population where there are no limiting factors?
CorrectIncorrect -
Question 18 of 20
18. Question
1 point(s)The diagram shows a vertical section through a leaf.
Which diagram shows the plant that the leaf was taken from?
CorrectIncorrect -
Question 19 of 20
19. Question
1 point(s)What is a mutation?
CorrectIncorrect -
Question 20 of 20
20. Question
1 point(s)Over the last 30 years some antibiotics have become less effective in treating bacterial infection.
What is the reason for this?CorrectIncorrect
