Exampro Biology - Bioenergetics

Many students understand the theory but struggle with . Exampro resources provide:

Because when you walk into that GCSE Biology exam and see a graph of pondweed bubbles or a question on oxygen debt, you will smile. You will have seen it before. You will have practiced it on Exampro. And you will be ready. exampro biology bioenergetics

Exampro questions frequently focus on . These are environmental conditions that, if in short supply, restrict the rate of photosynthesis: Many students understand the theory but struggle with

Exampro gives graphs with a flat line. Students write: "The rate stays the same." That earns zero marks. You must write: "The rate is constant because [light/CO₂/temp] is not limiting; another factor is now limiting the rate." You will have practiced it on Exampro

(1 mark) (b) The student counts bubbles for 2 minutes and divides by 2 to get bubbles per minute. Why does she do this? (1 mark) (c) At 30 cm, she counts 12 bubbles in 2 minutes. Calculate the rate of photosynthesis in bubbles per minute. (1 mark) (d) Explain why the number of bubbles decreases as the distance from the lamp increases. (1 mark)

(a) Light intensity / distance from lamp (1) (b) To calculate mean rate per minute / allows fair comparison (1) (c) 6 bubbles per minute (1) (d) Light intensity decreases with distance (inverse square law) → less energy for photosynthesis → fewer oxygen bubbles (1)