Biodiversity & Ecosystem Stability — NEET Biology
📚 Practice ConceptA stable community should not show too much variation in productivity from year to year; it must be either resistant or resilient to occasional disturbances (natural or man-made), and it must also be resistant to invasions by alien species. We don't know how these attributes are linked to species richness in a community, but David Tilman's long-term ecosystem experiments using outdoor plots provide some tentative answers. Tilman found that plots with more species showed less year-to-year variation in total biomass. He also showed that in his experiments, increased diversity contributed to higher productivity.
Choose the correct statements: 1. Tilman showed more species meant stable biomass. 2. Productivity is higher with richer diversity. 3. Stable communities resist alien invasions. 4. Rivet popper hypothesis compares ecosystems with airplanes. 5. Rivets on seats are less critical than those on wings.
View solution & NCERT explanation
Correct answer: C — 1, 2, 3, 4
Tilman demonstrated that biomass is more stable in species-rich plots. Productivity rises with more species. Stable communities resist alien invasions. Rivet hypothesis compares species with rivets. Statement 5 is false as rivets on wings are critical.
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