Cambridge IGCSE Biology (0610) - IGCSE Biology - Populations (19.4)

🎓 IGCSE Biology - The Complete Course: https://www.tes.com/teaching-resource/resource-12989155 IGCSE Chemistry - The Complete Course: 🎓 Complete Teaching Resource (including past exam questions and mark schemes organised by chapter): https://www.tes.com/teaching-resource/resource-13280954 🎓 Student resource (PDF only): https://www.tes.com/teaching-resource/resource-13245244 🎓 All the videos (the complete library on Patreon): https://www.patreon.com/igbiocomplete ☕️ Buy me a coffee - https://www.buymeacoffee.com/ArthurJohnParker Cambridge IGCSE Biology (0610/0970) Chapter 19 - Organisms and their environment Topic 19.4 - Populations For exams from 2025 (core and extended) As always this video follows the Cambridge syllabus exactly and contains absolutely everything you need to know for your final exam! My other channels: @igpecomplete - Cambridge IGCSE PE @ocrpecomplete - OCR GCSE PE Timestamps: 0:00 Contents 0:33 Population, community and ecosystem 1:22 Factors affecting rate of population growth 3:03 The sigmoid curve 3:41 The sigmoid curve (extended) Core content: - Describe a population as a group of organisms of one species, living in the same area, at the same time. - Describe a community as all of the populations of different species in an ecosystem. - Describe an ecosystem as a unit containing the community of organisms and their environment, interacting together. - Identify and state the factors affecting the rate of population growth for a population of an organism, limited to food supply, competition, predation and disease. - Identify the lag, exponential (log), stationary and death phases in the sigmoid curve of population growth for a population growing in an environment with limited resources. - Interpret graphs and diagrams of population growth. Extended content: - Explain the factors that lead to each phase in the sigmoid curve of population growth, making reference, where appropriate, to the role of limiting factors.