Algae can be grown in transparent tubes called photobioreactors. The algae are used to make animal feed.
Waste gas from a power station is bubbled through the tubes. The waste gas contains a high concentration of carbon dioxide.
Explain how bubbling the waste gas through the tubes increases the biomass of algae produced.
Photosynthesis is an endothermic reaction.
Explain why the algae need a continuous supply of light to keep producing biomass.
On hot days, the tubes are cooled with sprays of water.
Explain why.
The operators found that increasing the carbon dioxide supply at night had no effect on the growth of the algae.
Explain why.
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.