Biology 4BI1/2B January 2021 | Edexcel International GCSE Past Papers With Mark Scheme

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1. Plastic Pollution and Bioaccumulation: Impact of plastic waste on marine life, ingestion by turtles and whales, microplastics in food chains, and effects on biodiversity.

2. Urinary System and Excretion: Structure and function of the nephron, urine composition, effects of salt intake on urine production, and factors affecting urine volume.

3. Micropropagation and Plant Growth: Definition of in vitro, effects of pH on shoot growth, process of obtaining explants, and benefits of cloning over seed propagation.

4. Leaf Structure and Photosynthesis: Adaptations of different leaf layers, role in gas exchange, function of stomata in water loss, and impact of anti-transpirant sprays on plant growth.

5. Genetics and Protein Synthesis: DNA and mRNA base sequences, non-overlapping codons, translation process in ribosomes, and definition of an organism’s genome.

6. Enzymes and Reaction Rates: Catalase function in hydrogen peroxide breakdown, effects of enzyme concentration on reaction rate, experimental controls, and measuring oxygen release.

Edexcel International GCSE Biology (4BI1) Jan 2021

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Biology 4BI1/2B January 2021 | Edexcel International GCSE Past Papers With Mark Scheme

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