Question 1
FA student investigates how the distance of a lamp from some pondweed affects the rate of photosynthesis.
The Figure shows the apparatus.
Figure
The student counts the number of bubbles given off in one minute with the lamp at different distances.
The Table shows the results.
Table
| Distance of lamp from pondweed in cm\text{cm}cm | Number of bubbles given off in one minute |
|---|---|
| 10 | 46 |
| 20 | 31 |
| 30 | 19 |
| 40 | 11 |
| 50 | 6 |
a.[1]
Name the gas in the bubbles.
b.[1]
The student changes the distance of the lamp.
Put a ring around the type of variable that the distance of the lamp is.
control dependent independent
c.[1]
Give one variable the student should keep the same.
d.[1]
Use the Table to describe the pattern in the results.
1.4 Photosynthesis Questions
117 exam-style questions on OCR GCSE Biology 1.4 Photosynthesis, covering 1.4.1 Photosynthesisers as biomass producers, 1.4.2 Factors affecting the rate of photosynthesis, and 1.4.3 Limiting factors in photosynthesis. Each one has a worked solution and a mark scheme showing where the marks go.