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Evolution & biodiversity Choose questions individually, practise online, or create a worksheet with matching answers. Counts include generated variants, not only authored originals.
Sample exercises Grades 8–12 · Evolution & biodiversity What is required for natural selection to change inherited trait frequencies? No offspring differences. Every individual deciding to change. Heritable variation linked to differences in reproductive success. Answer and explanation Heritable variation linked to differences in reproductive success.
Variation, inheritance and differential reproduction are central.
Grades 8–12 · Evolution & biodiversity Which evolves in the population-genetic sense over generations? A population's inherited composition. A rock learning to move. A single individual because it wishes to adapt. Answer and explanation A population's inherited composition.
Evolution is a change across generations in populations.
Grades 8–12 · Evolution & biodiversity A trait occurs in 20 of 100 organisms, then 40 of 100 in a later sample. What is the increase in percentage points? Answer and explanation 20
40% − 20% = 20 percentage points, not a 20% relative increase.
Grades 8–12 · Evolution & biodiversity Why is “animals grew the trait because they needed it” incomplete or misleading? Answer and explanation It omits pre-existing or arising variation, inheritance and differential reproduction.
Replace need-based intent with a population mechanism.
Grades 8–12 · Evolution & biodiversity Is the same trait necessarily advantageous in every environment? Only for every dominant allele. Yes. No. Answer and explanation No.
Benefits and costs depend on conditions.
Grades 8–12 · Evolution & biodiversity Why should survival alone not be the only outcome considered in natural selection? Answer and explanation Contribution to later generations through reproduction also matters.
Survival without reproduction need not increase allele representation.
Study notes Avoid saying individuals evolve because they need a trait.
Grades 8–12 Avoid saying individuals evolve because they need a trait.
Grades 8–12 Separate similarity, ancestry and the evidence used to classify.
Grades 7–11 Separate similarity, ancestry and the evidence used to classify.
Grades 7–11