D4.3.10 (HL)—Disruption of phenological synchrony Topic Practice
D4.3.10 (HL)—Disruption of phenological synchrony Topic Practice

IB Biology syllabusBiology SL/HLFirst assessment 2025
Students practise interpreting real-world phenological mismatches—like Arctic plant–reindeer timing or great tit–caterpillar synchrony—to explain climate-driven ecological…
How this is tested
- explain how mismatched timing between great tit breeding and caterpillar peak abundance reduces chick survival
- link observed shifts in Arctic plant flowering and reindeer calving dates to reduced neonatal nutrition
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