Biology Paper 1 · B4 · Lesson 4.9
Compare several factors, use the inverse square law and consider profit.
Higher Tier only. Several factors interact. Compare curves where only one condition changes. If raising carbon dioxide increases the rate at the same light intensity, carbon dioxide was limiting under the lower-CO₂ conditions.
Compare at the same horizontal-axis value, not at different light intensities.
No timer. Read the explanation after each answer.
Daily 5 · Core exam practice · Higher Tier questions · A4 revision sheet
Lessons 4.1–4.8 cover the core. Lessons 4.9–4.10 are Higher Tier only. Daily 5 practises core facts.
AQA Combined Science Trilogy specification · 4.4.1.2 · Higher Tier only. Original notes, questions and diagrams. Experimental numbers are illustrative.
Photographs: pondweed by Frank Vincentz; dough by ElinorD, both CC BY-SA 3.0. Polytunnel by Bob Nichols / USDA, public domain. Images displayed without cropping or other alterations.
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