Biology Paper 1 · B4 · Lesson 4.4
Investigate how light intensity affects oxygen production.
An aquatic plant such as pondweed can release visible gas bubbles while photosynthesising. The gas is mainly oxygen. Measure the gas produced in a fixed time to estimate the photosynthesis rate.
A real aquatic plant helps connect the practical to photosynthesis.
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 · Required practical 5. 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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