IGCSE Biology 0610/21 May/June 2025 — Every Single Question EXPLAINED From Scratch | Nothing Skipped

🎯 *IGCSE Biology Paper 2 May/June 2025 (0610/21) — FULLY SOLVED & EXPLAINED!* In this video, I walk you through EVERY single question in the May/June 2025 IGCSE Biology Paper 2 (0610/21) step by step. Nothing is skipped, and nothing is rushed. Every answer is fully explained so you understand exactly why it is correct — not just what the answer is. Whether you just sat this exam and waNt to check your answers, or you are revising for upcoming sessions — this video covers everything you need to master your multiple-choice paper. ✅ Every question solved step-by-step ✅ Every answer fully explained ✅ Mark scheme breakdown ✅ Examiner tips and common traps included ✅ Perfect for complete revision ━━━━━━━━━━━━━━━━━━━━━━━━━━━ ⏱️ TIMESTAMPS / VIDEO CHAPTERS ━━━━━━━━━━━━━━━━━━━━━━━━━━━ 0:00 - Intro and Q1 - Nutrition and CO2 Diffusion into Leaf 1:20 - Q2 - Characteristics of Birds 2:40 - Q3 - Structures in Both Plant and Animal Cells 4:00 - Q4 - Active Transport Statements 5:20 - Q5 - DNA Base Pairing (Adenine and Thymine) 6:40 - Q6 - Biuret Test for Protein 8:00 - Q7 - Enzyme Activity at 55C (Denaturation) 9:20 - Q8 - Spongy Mesophyll Tissue Adaptations 10:40 - Q9 - RDA Table and Rickets Diagnosis 12:00 - Q10 - Assimilation Definition 13:20 - Q11 - Trypsin Function in Digestion 14:40 - Q12 - Humidity and Transpiration Rate 16:00 - Q13 - Humidity Effect on Transpiration Graph 17:20 - Q14 - Sources and Sinks in Spring (Daffodil) 18:40 - Q15 - Blood Circulation in Fish 20:00 - Q16 - Active Immunity Diagram 21:20 - Q17 - Cholera Toxin and Water Movement 22:40 - Q18 - Breathing at Rest and Diaphragm Relaxing 24:00 - Q19 - Processes Requiring Energy from Respiration 25:20 - Q20 - Glomerulus Function (Ultrafiltration) 26:40 - Q21 - Synapse Diagram Labelling 28:00 - Q22 - Rod Cells vs Cone Cells 29:20 - Q23 - Endocrine Gland and Adrenaline Response 30:40 - Q24 - Vasodilation Response to Overheating 32:00 - Q25 - Phototropism and Auxin 33:20 - Q26 - Antibiotics vs Viruses 34:40 - Q27 - Asexual Reproduction in Hydra 36:00 - Q28 - Menstrual Cycle Hormones Graph 37:20 - Q29 - Mitosis Chromosome Diagram 38:40 - Q30 - Codominance and Hair Colour in Cattle 40:00 - Q31 - Gene Expression in Phagocytes and Neurons 41:20 - Q32 - Leaf Adaptations for Hot Dry Habitats 42:40 - Q33 - Natural vs Artificial Selection 44:00 - Q34 - Pyramid of Energy 45:20 - Q35 - Secondary Consumers in Ocean Food Web 46:40 - Q36 - Nitrifying Bacteria and Heating Soil 48:00 - Q37 - Lag Phase in Population Growth Graph 49:20 - Q38 - Biodiversity Definition 50:40 - Q39 - Eutrophication and Sewage 52:00 - Q40 - Genetic Modification and Insulin Production 53:30 - Outro ━━━━━━━━━━━━━━━━━━━━━━━━━━━ 📚 ABOUT THIS CHANNEL ━━━━━━━━━━━━━━━━━━━━━━━━━━━ *CAIE Sciences Mastered* is your one-stop channel for IGCSE and A Level Sciences. We cover Biology, Chemistry, and Physics — syllabus items explained, past papers fully solved, and exam tips that actually help you score higher. 🔔 *SUBSCRIBE* and turn on notifications so you never miss a video breakdown! ━━━━━━━━━━━━━━━━━━━━━━━━━━━ 📌 COMING SOON ON THIS CHANNEL ━━━━━━━━━━━━━━━━━━━━━━━━━━━ ✦ IGCSE Biology Full Syllabus Explained (0610) ✦ IGCSE Biology Paper 4 & Paper 6 Past Papers Solved ✦ IGCSE Chemistry 0620 Full Solutions ✦ IGCSE Physics 0625 Full Solutions ✦ AS & A2 Biology 9700 Complete Coverage #IGCSEBiology #IGCSEBiology0610 #CAIESciencesMastered #CIEBiology #IGCSEPastPapers