A student moves a lamp closer to pondweed. The temperature of the water also increases.
Which change would best prevent the temperature increase?
Replace the pondweed with a freshly cut longer shoot.
Place the pondweed in a thermostatically controlled water bath.
Replace the lamp with an identical lamp positioned closer.
Place the pondweed in solution with more dissolved hydrogencarbonate.
44 exam-style questions on Edexcel GCSE Biology 6.1 Photosynthesis, covering 6.1.1 Photosynthetic organisms as producers, 6.1.2a Limiting factors on the rate of photosynthesis, 6.1.2b Interactions of limiting factors on photosynthesis, and 6.1.3 Inverse square law and light intensity. Each one has a worked solution and a mark scheme showing where the marks go.