Module 7 · Practice
Practice questions
Three difficulty levels.
Section A — Easy
Name three resources animals compete for.
Classify each variation as continuous or discontinuous:
Where in a cell are the chromosomes found?
Define adaptation.
Give two causes of extinction.
Section B — Medium
Describe two adaptations of a polar bear and explain how each helps it survive.
Suggest whether each is genetic, environmental, or both:
Outline the four steps of natural selection.
Why did the population of dark peppered moths increase during the Industrial Revolution?
Explain why a hospital may struggle to treat infections caused by antibiotic-resistant bacteria.
Section C — Hard
A new predator is introduced to an island. The native rabbits have a range of running speeds. Use natural selection to predict what will happen to the rabbit population over many generations.
Explain why identical twins, who share their DNA, are not identical in every way.
A pupil suggests we should preserve every species at all costs. Give one argument for and one argument against this view.
Suggest why a species with little genetic variation is more vulnerable to extinction than one with lots of variation.