Bean roots in aerated soil can use the pathway represented by the equation C6H12O6+6O2→6CO2+6H2O\text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2 \rightarrow 6\text{CO}_2 + 6\text{H}_2\text{O}C6H12O6+6O2→6CO2+6H2O. If the soil becomes waterlogged, the roots can instead ferment glucose. A root cell must transfer a fixed amount of energy.
Which option correctly interprets what happens when the cell changes from the pathway represented by the equation to fermentation?
It must break down less glucose because fermentation does not require a supply of oxygen
It must break down the same amount of glucose because both pathways begin with glucose
It cannot transfer any energy because fermentation takes place without oxygen
It must break down more glucose because fermentation transfers less energy from each glucose molecule
92 exam-style questions on AQA GCSE Biology 4.2 Respiration, covering 4.2.1 Aerobic and anaerobic respiration, 4.2.2 Response to exercise, and 4.2.3 Metabolism. Each one has a worked solution and a mark scheme showing where the marks go.