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1. 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
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 ... show full transcript
Worked Solution & Example Answer:1. 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
Step 2
Explain the effect of light intensity on the number of small plants per m².
Answer
The data indicates that as light intensity decreases, the mean number of small plants per m² also decreases. Higher light intensity (e.g., 1500 lux) supports more small plants (2.7 per m²) compared to lower intensities. This is likely because light is essential for photosynthesis, allowing plants to grow and reproduce. A lack of sufficient light can limit plant growth, resulting in fewer small plants.
Step 3
State one variable the scientist should have controlled to make sure the light intensity measurements could be compared.
Answer
One variable the scientist should have controlled is the same time of day for all light intensity measurements. This ensures that factors such as the position of the sun and shadows are consistent.
Step 4
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 start at one edge of the woodland and set up a belt transect. They should lay a measuring tape along a straight line through the area where stinging nettles grow. At regular intervals along this transect, the scientist should measure the height and density of stinging nettles. Additionally, they should record light intensity at each point using a light meter. This method allows for direct comparison of light levels with nettle growth, facilitating the assessment of the relationship between these two factors.