Biodiversity's Role in Ecosystem Stability — NEET Biology

Correct answer: B — S1 and S4 only

Let's evaluate each statement concerning the reasons for high tropical biodiversity: S1: Tropical latitudes have remained relatively undisturbed for millions of years, providing a long evolutionary time for species diversification. This statement is correct. S2: Tropical environments are less seasonal, more constant, and predictable, which promotes niche specialisation, leading to greater diversity. The statement claims high seasonality and unpredictable climates, which is incorrect. S3: Higher solar energy availability in the tropics contributes to higher productivity, which *indirectly* contributes to greater diversity, not directly through increased primary consumption as stated. Therefore, this statement is incorrect. S4: Temperate regions experienced frequent glaciations in the past, leading to reduced evolutionary time for speciation compared to the stable tropical regions. This statement is correct. S5: David Tilman's long-term experiments showed that plots with more species (higher diversity) exhibited *less* year-to-year variation in total biomass, not higher variation. Therefore, this statement is incorrect. Thus, statements S1 and S4 are correct. The correct option is B.