Statement 1: Biodiversity generally exhibits a latitudinal diversity gradient, meaning species richness is higher in lower latitudes (tropical regions) and decreases towards higher latitudes (polar regions). This pattern is attributed to factors such as greater solar energy, stable climate, higher primary productivity, and longer evolutionary periods in tropical environments.
Statement 2: Along mountain gradients, biodiversity typically decreases with increasing altitude. Higher altitudes are characterized by progressively harsher environmental conditions, including lower temperatures, reduced atmospheric pressure, increased ultraviolet radiation, and less developed soils. These conditions limit the range and abundance of species capable of thriving at elevated elevations.
Both statements accurately describe established ecological principles regarding biodiversity distribution.
Option A is incorrect because statement 2 is a correct observation.
Option B is incorrect because statement 1 is a correct observation.
Option D is incorrect because both statements 1 and 2 are correct.