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Figure 1 shows an area of woodland with some small plants growing in the ground between the trees - Edexcel - GCSE Biology Combined Science - Question 1 - 2021 - Paper 1
Question 1
Figure 1 shows an area of woodland with some small plants growing in the ground between the trees. (a) Name a group of organisms that break down the dead leaves and... show full transcript
Worked Solution & Example Answer:Figure 1 shows an area of woodland with some small plants growing in the ground between the trees - Edexcel - GCSE Biology Combined Science - Question 1 - 2021 - Paper 1
Step 1
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Explain the effect of light intensity on the number of small plants per m²
Answer
As light intensity increases, the number of small plants per m² tends to increase. This is because light is essential for photosynthesis, which is critical for plant growth. In the data provided, areas with higher light intensity (such as area A with 1500 lux) correspond to a greater number of small plants (2.7 plants/m²). Conversely, lower light intensity results in fewer plants as observed in the lower light areas with significantly reduced plant numbers.
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Describe how the scientist should use a belt transect to investigate how light intensity affects the growth of stinging nettles
Answer
To investigate how light intensity affects the growth of stinging nettles, the scientist should first select a transect that runs from the shaded area into the open area of the woodland. The scientist should then place a belt transect (a tape measure) along this line. Along the transect, measurements of light intensity should be taken at regular intervals. Additionally, the scientist can record the height and density of stinging nettles at these same points. This methodology allows for the correlation of light intensity levels with the growth characteristics of the stinging nettles observed.