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Which event is most clearly a density-independent cause of mortality in a small mammal population? A. Increased competition for burrows as numbers rise B. More rapid spread of infection at high density C. A sudden volcanic ash fall that buries the habitat D. A…
Roots of one plant release a compound that suppresses the growth of neighbouring plants of another species. What is this chemical interaction called? A. Allelopathy B. Cooperative hunting C. Obligate mutualism D. Parasitic ingestion
Which assumption is required when applying Hardy–Weinberg equilibrium to a model population? A. Strong selection favours heterozygotes every generation B. Individuals choose mates according to the studied genotype C. A continuing supply of new alleles enters…
Over many generations, farmers save seed only from squash plants with a preferred fruit shape. Which process best explains the resulting change in the crop? A. Individuals reshape their own genes because the trait is needed B. Humans preferentially reproduce…
A eukaryotic cell contains a nucleus next to its rough endoplasmic reticulum. Which description applies to the nucleus? A. DNA associated with proteins is enclosed by two membranes B. Cristae surround the cell’s principal site of ATP production C. Stacked…
Identify the year with the largest mean tussock-grass biomass where mice were present.
Compare and contrast the mean biomasses of the two grass types in 2006, considering both mouse treatments.
Deduce which grass type supplies the mice’s food, supporting your answer with the biomass data.
Calculate the difference between the two mean volume changes in the later experiment.
Outline the apparent conflict between the volume experiment and the earlier biomass results.