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Sigmoid Curve

📈 The Sigmoid Curve – how populations grow Ever seen a population graph that looks like an ‘S’? That’s the sigmoid curve — and it’s a classic exam topic. Here’s the full story: 🔍 Phase 1: Lag Phase At first, population growth is slow. Organisms are adapting to their new environment, finding mates, and starting reproduction. Birth rate is low, but conditions are preparing for growth. 🔍 Phase 2: Exponential (Log) Phase Boom! Resources are plentiful, predators are few, and every individual can reproduce at its maximum rate. The birth rate far exceeds the death rate — population size rockets upward. 🔍 Phase 3: Plateau (Stationary Phase) The population reaches the carrying capacity — the maximum number the environment can support. Birth rate and death rate are roughly equal. Population size stabilises, unless a new change occurs. 🔍 Phase 4: Death Phase Waste products build up. Birth rate begins to drop while death rate rises. 🌟 Exam tip: Label all four phases and link each one to environmental conditions and limiting factors. Marks are often lost by skipping the explanations! 📚 Master graphs, data analysis, and tricky exam terminology with Chimera Biology — clear diagrams, interactive quizzes and concise notes for Cambridge IGCSE Biology. 🌐 Click the link in the bio to check out Chimera Biology. #IGCSEBiology #CambridgeIGCSE #StudyTok #RevisionTips #BiologyRevision #ExamSuccess #StudentLife #ChimeraBiology #SigmoidCurve #PopulationGrowth #Ecology #ScienceTok #StudyMotivation