Biology 4BI1/1B January 2021 | Edexcel International GCSE Past Papers With Mark Scheme

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1. Genetics and Reproduction: X chromosome count in sperm cells, mitochondrial function in sperm movement, acrosome role in fertilization, and sperm route to the egg.

2. Ecology and Energy Transfer: Primary consumers in a food chain, photosynthesis process, inefficiency in energy transfer between trophic levels, and adaptations of birds for digestion.

3. Human Circulatory System: Blood vessel oxygen and glucose content, differences in arterial and venous structures, and the effect of training on capillary density in muscles.

4. Plant Biology and Natural Selection: Effect of zinc pollution on plant survival, selection for zinc tolerance, and methodology for comparing population sizes at different distances.

5. Animal Physiology and Heat Loss: Heat retention in animals kept indoors vs. outdoors, experimental setups for heat loss measurement, and variables affecting heat retention.

6. Nervous System and Response: Structure and function of motor neurons, advantages of reflex actions, myelin sheath role in impulse transmission, and the effect of neuron diameter on impulse speed.

Edexcel International GCSE Biology (4BI1) Jan 2021

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Biology 4BI1/1B January 2021 | Edexcel International GCSE Past Papers With Mark Scheme

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