L1 is a slide of a stained transverse section through a plant leaf.
Fig. 2.1 shows an image of some epidermal cells from the surface of a different leaf, viewed under a microscope.
8 µm
[Figure 2.1]
Plants of the same species were grown for 6 months. Each plant was grown in a different percentage of shade.
After 6 months, the mean specific leaf area was recorded, as shown in Table 2.1.
Table 2.1
| percentage shade | mean specific leaf area /cm²g⁻¹ |
|---|---|
| 5 | 118 |
| 40 | 140 |
| 50 | 151 |
| 60 | 153 |
| 90 | 206 |
[Figure 2.2]

Q: What topic does this question test?

This question tests Cell structure in A-Level Biology (syllabus code 9700). It is worth 21 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Biology May/June 2022 examination, Paper 3 Variant 3 (9700_s22_qp_33.pdf).

Question

L1 is a slide of a stained transverse section through a plant leaf.
Fig. 2.1 shows an image of some epidermal cells from the surface of a different leaf, viewed under a microscope.
8 µm
[Figure 2.1]
Plants of the same species were grown for 6 months. Each plant was grown in a different percentage of shade.
After 6 months, the mean specific leaf area was recorded, as shown in Table 2.1.
Table 2.1
| percentage shade | mean specific leaf area /cm²g⁻¹ |
|---|---|
| 5 | 118 |
| 40 | 140 |
| 50 | 151 |
| 60 | 153 |
| 90 | 206 |
[Figure 2.2]

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