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| Pregunta | Respuesta |
| B1 Revision | Questions on Topic 1, Topic 2 and Topic 3 of B1 :) |
| Q: What are the ranks in the classification system? (List in order) | A: Kingdom, Phylum, Class, Order, Family, Genus, Species |
| Q: Describe the main symptoms of sickle cell disease. (3) | A: Weakness/ Fatigue Shortness of breath Swelling of hands and feet Blocked blood vessels |
| Q: Using your knowledge of natural selection, suggest why the dodo may have become extinct. (3) | A: • Predation / disease (1) • change in environmental conditions (1) • loss of food source / reduced food source (1) • increased competition (1) •survival of the fittest (1) |
| Q: Describe the causes of variation in a population. (2) | A: genetic (variation) due to mutation due to sexual reproduction / interbreeding / hybridisation environmental (variation) |
| Explain how stimulants affect neurotransmission. (3) | • stimulants act at the synapse • more neurotransmitters • so speeds up neurotransmission |
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