The table shows gas collected from two pondweed shoots.
Table
| Shoot | Length in cm | Gas volume in cm3\text{cm}^3cm3 | Time in minutes |
|---|---|---|---|
| P | 4 | 8 | 2 |
| Q | 8 | 12 | 3 |
Which statement correctly compares gas production per minute per centimetre of shoot?
Q produces three times as much as P.
P produces three times as much as Q.
Q produces twice as much as P.
P produces twice as much as Q.
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.