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.
What does NCERT say about stable community should not?
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Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.