Official Answer Key & Detailed Solution
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Correct Answer: Option (B) — 1 and 2 only
Concept & Option Breakdown
Standard Reference VerifiedStatement 1 is correct: Beyond 3°C of warming, terrestrial ecosystems (like forests and peatlands) face severe dieback and increased respiration, transitioning from net carbon sinks to net carbon sources.
Statement 2 is correct: Coral reefs are highly temperature-sensitive; warming beyond 2°C leads to catastrophic bleaching and widespread mortality worldwide.
Statements 3 and 4 are incorrect: Extreme qualifiers like 'all global wetlands permanently disappear' and cereal cultivation being impossible 'anywhere in the world' are scientifically implausible. High-latitude and temperate regions would still support certain cereal crops.
Statements containing extreme words like 'All' or 'anywhere in the world' are almost always scientifically incorrect in ecological assessments.
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