IGCSE Biology 0610 Paper 4 Extended Revision (Part 2) | Oct/Nov 2026 Exam-Style Questions

Sitting Cambridge IGCSE Biology 0610 Paper 4 (Extended Theory) this October/November 2026? Part 2 of my two-part Paper 4 revision series completes the whole paper: Questions 5 to 8 (40 marks) solved step by step, so you learn exactly how to write answers that earn the marks. ▶ Full playlist (all parts, in order):    • IGCSE Biology 0610 Paper 4 Extended Revisi...   ◀ Part 1 (Questions 1 to 4):    • IGCSE Biology 0610 Paper 4 Extended Revisi...   🔔 Subscribe for more IGCSE revision:    / @nurnabisirigcse   📄 Download the blank revision paper (PDF) and try the questions yourself before watching: https://drive.google.com/file/d/1JE26... ✅ Check your answers with the full worked solutions and mark scheme (PDF): https://drive.google.com/file/d/1InTg... In this video I solve questions 5 to 8 of my own Paper 4 revision paper, written in the style of the real Cambridge 0610 Extended theory paper. Topics covered include: Inheritance: defining allele and homozygous, working out parent genotypes from a cystic fibrosis family tree, completing a genetic diagram, and finding the probability that a child has the condition or is a carrier Food webs and energy transfer: writing a food chain, secondary and quaternary consumers, predicting what happens when a predator dies out, calculating percentage energy transfer to one decimal place, and why energy is lost between trophic levels Homeostasis and blood glucose: comparing blood glucose graphs (type 1 diabetes), how insulin and negative feedback return glucose to normal, defining homeostasis, and the reflex arc (motor neurone and effector) Natural selection and biotechnology: how bacteria become resistant to antibiotics, how bacteria are genetically modified to make human insulin, and how farmers use selective breeding to produce cows that give more milk ⏱ Chapters: 0:00 Introduction 0:47 Q5 Inheritance and the cystic fibrosis family tree 4:42 Q6 Food webs and energy transfer 9:03 Q7 Blood glucose, homeostasis and reflex action 13:10 Q8 Natural selection, genetic modification and selective breeding 16:25 Final exam advice Every answer is explained clearly, so you understand why it works and how to word it the way examiners expect. 🎓 PRIVATE ONLINE TUITION with Nur Nabi Sir (IGCSE Maths, Physics, Chemistry & Biology) • One-to-One lessons: a personal plan, your own pace, your weak topics fixed. • Small-Batch classes: a small group of serious students, live online, with exam-style practice. Both include past-paper practice, exam technique and doubt clearing. Students and parents worldwide are welcome. 💬 WhatsApp: https://wa.me/966533147491 (+966 53 314 7491) 📩 Email: nurnabisirigcse@gmail.com 🏠 HOME TUITION IN JEDDAH: face-to-face lessons, booked on WhatsApp. Message me for a FREE trial class, and please include your name, subject, exam board, grade and time zone. Who is this for? Cambridge IGCSE Biology 0610 Extended students preparing for Paper 4 in the Oct/Nov 2026 session, and anyone revising for the 2027 exams. Teachers and parents can use it as a ready-made revision lesson. It also helps students sitting Edexcel International GCSE Biology. Exam tips: In a genetic diagram, write the gametes in circles, show every genotype, and give the probability as a fraction or a percentage. For a percentage, write the working: part divided by whole, times 100, and check the decimal places. In natural selection, always write the four steps: variation, a selection pressure, the best adapted survive and reproduce, and they pass on their alleles. How to use this video: pause, attempt each question yourself first, then watch the worked answer and mark your own work. Tonight, sit the whole paper again from a blank page in 1 hour 15 minutes and mark it with the solutions. If this helped your revision, please like the video, subscribe to the channel and turn on notifications. Share it with a friend sitting IGCSE Biology, and comment with the topic you want me to cover next. I read every comment and reply. Good luck with your exams! #IGCSE #IGCSEBiology #0610 #CambridgeIGCSE #BiologyRevision