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Which description correctly identifies a nutritional strategy? A. A photoautotroph obtains all its carbon by ingesting other organisms B. A saprotroph must use sunlight to fix carbon dioxide C. A mixotroph can combine photosynthesis with uptake of organic food…
Which role does the snail occupy in the chain? A. Herbivore feeding on a producer B. Predator feeding on the duck C. Photosynthetic primary producer D. Decomposer feeding only on dead animals
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 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…
Over generations, individuals with a heritable trait leave more offspring, and the trait becomes more common. What is the resulting population-level change? A. Every individual has deliberately adapted its genes B. All genetic variation must disappear…
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…
State which route contributes most to exposure in the youngest age group.
Estimate the contribution of water for children aged 1–3 years.
Suggest how a change in behaviour or diet with age could alter the relative contributions of the routes.
State the mean blood lead concentration in region A in 1982.