Spinach plants grow best under specific light conditions. To increase the yield of spinach plants, a grower uses high-pressure sodium (HPS) lamps to provide additional light.
The increase in dry mass (DDD) produced when using additional light can be calculated using this equation:
D=L0.5F D = \frac{L}{0.5F} D=0.5FLwhere:
The table below shows some of these values for HPS lamps:
| L / MJ m−2 h−1L \text{ / MJ m}^{-2}\text{ h}^{-1}L / MJ m−2 h−1 | F / MJ kg−1F \text{ / MJ kg}^{-1}F / MJ kg−1 |
|---|---|
| 4.15 × 10-2 | 16 |
Use the equation and the table to calculate the increase in dry mass produced when using HPS lamps.
Give your answer in standard form and give the units.
3 exam-style questions on AQA A Level Biology Energy and ecosystems (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.