A student grew bacteria in a nutrient broth.
The Table shows the number of bacteria in the broth over three hours.
Table
| Time in hours | Number of bacteria |
|---|---|
| 0 | 2.0 × 103 |
| 1 | 8.0 × 103 |
| 2 | 3.2 × 104 |
| 3 | 1.28 × 105 |
Calculate the increase in the number of bacteria between 0 hours and 3 hours. Give your answer in standard form.
Calculate the percentage increase in the number of bacteria between 0 hours and 1 hour.
The number of bacteria continues to increase in the same way.
Predict the number of bacteria at 4 hours. Give your answer in standard form.
Each bacterium has a mass of 1 × 10-12 g.
Calculate the total mass of the bacteria at 3 hours. Give your answer in μg\mu\text{g}μg.
48 exam-style questions on Edexcel GCSE Biology 1.2 Number, size and scale, covering 1.2.1 Number, size and scale with estimations and 1.2.2 Quantitative units in relation to cells. Each one has a worked solution and a mark scheme showing where the marks go.