Human Biology 4HB1/01 November 2020 | Edexcel IGCSE Past Papers With Mark Scheme

Edexcel International GCSE Human Biology (4HB1) Nov 2020

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1. Paper: Edexcel IGCSE Human Biology 4HB1/01 (Nov 2020); total 90 marks; topics: digestion, respiration, reflex arcs, blood groups, nervous system, DNA replication, mitosis, meiosis, enzyme usage, biosensors, musculoskeletal system.
2. Alimentary canal analysis: regions for digestion start (carbohydrates, proteins), acidic pH in stomach, villi in small intestine, water absorption in large intestine, bile duct connection.
3. Experimental biology: calorimetry using popcorn, energy transfer inefficiencies, safety precautions, control variables in food energy comparison.
4. Blood group genetics: antigen presence in A, B, AB, O types; transfusion compatibility; calculation of eligible blood recipients; inheritance and codominance principles.
5. Nervous system and reflexes: types of neurones (sensory, relay, motor), reflex arc function, synaptic transmission, Alzheimer’s effect on neuron structure and acetylcholine levels.
6. Genetic processes: mitosis vs meiosis, DNA replication order and base-pairing, genetic base identification, inheritance implications, importance of meiosis in gamete variation.