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Which pair of human activities could best account for the change in these model land-cover maps? A. Natural regeneration and planting native trees B. Timber clearance and conversion to crop plantations C. Rewilding and forest restoration D. Afforestation and…
Which description correctly characterizes holozoic nutrition? A. Autotrophic, with external digestion B. Heterotrophic, with internal digestion C. Saprotrophic, with only extracellular digestion outside the body D. Photoautotrophic, without ingestion
Which labelled organism is a mixotroph according to the energy-flow diagram? A. Grazer Z B. Organism X C. Bacteria D. Organism Y
A fungal partner forms an association with the roots of a photosynthetic woodland plant. What benefit does the fungal network commonly supply? A. Conversion of sunlight into sugar for the plant B. Production of a protective animal skeleton C. Improved uptake…
Which situation is an example of top-down population control? A. Grazing snails reduce the abundance of algae B. Rainfall limits the growth of grasses C. Algae supply more food and increase snail abundance D. Phosphate availability limits algal growth
Which pair can each occupy the tertiary-consumer level in at least one chain shown? A. Geese and mussels B. Ducks and eagles C. Zooplankton and small fish D. Algae and large fish
The diagram is a pyramid of energy. Which reading is valid? A. Producers reflect exactly19200units of incoming sunlight B. The36units belong to decomposers at every level C. Primary consumers receive4800kJ m⁻² year⁻¹ D. Secondary consumers receive4800units
Selection favours two contrasting trait extremes while intermediates leave fewer offspring. What is a likely result? A. Immediate disappearance of all genetic variation B. Stabilization around the original intermediate mean C. Increased phenotypic and…
At a two-allele locus in Hardy–Weinberg equilibrium, the dominant allele frequency is0.65. What fraction is expected to show the recessive phenotype? A. 0.4225 B. 0.1225 C. 0.35 D. 0.455
A newly exposed lava surface begins with no soil and is protected from development. Which long-term change is most plausible? A. Primary succession builds soil and allows progressively larger vegetation to establish B. Secondary succession begins with an…