Figure 8 shows a root hair viewed using a microscope - AQA - GCSE Biology Combined Science - Question 5 - 2019 - Paper 1

To calculate the real length of the root hair, we can use the formula:

$\text{Real Length} = \frac{\text{Image Length}}{\text{Magnification}}$

Given that:

• Image Length (X–Y) = 43 mm
• Magnification = 50

First, convert the image length from millimetres to micrometres:

$43 \text{ mm} = 43 \times 1000 \text{ µm} = 43000 \text{ µm}$

Now, apply the values in the formula:

$\text{Real Length} = \frac{43000 \text{ µm}}{50} = 860 \text{ µm}$

Thus, the real length of the root hair is 860 µm.