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Edexcel IGCSE Biology Paper 1BR (4BI1/1BR) – January 2022 (1BR version) Question Paper

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Ace your Edexcel IGCSE Biology exams with this official January 2022 Paper 1BR question paper, exactly the type used by the British International School of Boston – the only private high school in Boston, Massachusetts offering Pearson Edexcel IGCSE qualifications. This authentic past paper covers desert food web (secondary consumers, longest food chain, energy transfer efficiency), fennec fox natural selection (large ears and thin body for heat loss), eye structure (cornea, ciliary muscles and suspensory ligaments for accommodation, iris controlling light entry), multiple sclerosis and blink reflex (impulse speed calculation 0.0050s over 25cm = 50 m/s, difference from 77 m/s = 27 m/s, motor neurone speed 120 m/s vs whole arc slower due to synapses), yeast cell (mitochondrion for aerobic respiration, chitin cell wall, cell membrane present in prokaryotes), bread dough investigation (percentage increase calculation at 35°C from 40mm to 45mm = 12.5%, yeast produces carbon dioxide by anaerobic respiration, higher temperature at 35°C increases enzyme activity vs 25°C, at 65°C enzymes denature), alimentary canal (peristalsis in oesophagus, liver produces bile), lipase inhibitor investigation (mean rate of pH change without inhibitor = 8.0-5.8 over 20 minutes = 2.2/20 = 0.11 pH units per minute, evaluation of obesity treatment – inhibitor reduces blood lipid from ~62 to ~40 mg/dm³ but causes abdominal pains and inconsistent results), mycoprotein fermenter (air for aerobic respiration, steam cleaning to kill contaminating microorganisms), GM fungus vs non-GM fungus (graph plotting, GM produces more mycoprotein after day 5 but similar at day 30, claim needs longer trial), mycoprotein vs lamb nutrition (mycoprotein has less fat and cholesterol, more fibre and calcium, but less protein and iron, discussion of healthy eating for growth), female reproductive system (ovulation at ovary, fertilisation in oviduct), menstrual cycle hormones (oestrogen and progesterone, oestrogen thickens uterus lining), placenta structure (large surface area, thin membranes, rich blood supply for efficient exchange), cat hypertrophic myopathy (dominant allele, less elastic left ventricle wall reduces stroke volume and cardiac output, pedigree analysis), leaf disc photosynthesis investigation (balanced equation 6CO₂+6H₂O→C₆H₁₂O₆+6O₂, reliability by repeating and calculating mean, dependent variable is time taken for disc to rise, increasing lamp distance decreases light intensity so slower photosynthesis = longer time), waste disposal methods (anaerobic digester carbon dioxide calculation for 125kg = 4.63 kg to 2 sf, evaluation of environmental friendliness – anaerobic digester produces least CO₂ and methane, produces biogas, landfill produces most methane which is potent greenhouse gas), thorax (trachea and bronchus, diaphragm relaxes and moves up to exhale), lung disease graph (smaller tidal volume and reduced flow rate causing breathlessness), woodlouse investigation design (light intensity as independent variable, choice chamber with different light levels, measure speed by timing movement over measured distance, control temperature and humidity, repeat with multiple woodlice). Perfect for realistic exam practice under timed conditions – ideal for students following the Pearson Edexcel International GCSE (9-1) Biology specification (4BI1) or Science Double Award (4SD0).

Meer zien Lees minder

Instelling

Senior / 12th Grade

Vak

BIOLOGY

Voorbeeld van de inhoud

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Instelling: Senior / 12th grade
Vak: BIOLOGY
School jaar: 4

Documentinformatie

Geüpload op: 2 april 2026
Aantal pagina's: 40
Geschreven in: 2025/2026
Type: Tentamen (uitwerkingen)
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ace your edexcel igcse biology exams with this off
edexcel igcse biology paper 1br 4bi11br janua

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Edexcel IGCSE Biology Paper 1BR (4BI1/1BR) – January 2022 (1BR version) Question Paper

Voorbeeld van de inhoud

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Recent door jou bekeken

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