Plant Structure (Edexcel GCSE Biology: Combined Science)

Figure 1 shows how the leaves are arranged on a plant.

Figure 1

Which reason explains why the leaves are arranged in this way?

Figure 2 shows guard cells and stomata on the lower surface of a leaf.

A ruler has been overlayed on the image for scale purposes.

Figure 2

Use the ruler overlay to measure the length of the line on the labelled guard cell in mm.

The actual length of the labelled guard cell is 0.05 mm.

Calculate the magnification of this image.

Figure 3 shows the number of stomata per mm² on the lower surface of leaves from plants growing in soils with different water content.

Figure 3

Explain the difference in the number of stomata per mm² on the leaves of the plants grown in dry and wet soils.