A researcher keeps two aquatic moss specimens in light. A bubble sensor records the oxygen released by each specimen for 3 minutes.
| Specimen | Number of bubbles in 3 minutes | Mean volume of one bubble in cm3\text{cm}^3cm3 |
|---|---|---|
| R | 28 | 0.015 |
| S | 21 | 0.024 |
What do these measurements show about which specimen has the higher rate of oxygen release?
Oxygen volume indicates that specimen S has the higher rate, whereas bubble count indicates specimen R.
Both oxygen volume and bubble count indicate that specimen R has the higher rate.
Both oxygen volume and bubble count indicate that specimen S has the higher rate.
Oxygen volume indicates that specimen R has the higher rate, whereas bubble count indicates specimen S.
87 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.