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The graph shows the rate of photosynthesis in a field containing grass plants, during a 12 hour period - Edexcel - GCSE Biology - Question 3 - 2012 - Paper 1
Question 3
The graph shows the rate of photosynthesis in a field containing grass plants, during a 12 hour period. time of day 6 am 9 am midday 3 pm 6 pm rate of phot... show full transcript
Worked Solution & Example Answer:The graph shows the rate of photosynthesis in a field containing grass plants, during a 12 hour period - Edexcel - GCSE Biology - Question 3 - 2012 - Paper 1
Step 1
Describe the trend shown by the graph from 6 am to 6 pm.
Answer
From 6 am, the rate of photosynthesis increases gradually, reaching a peak around midday. Following this peak, there is a noticeable decline in the rate of photosynthesis, which continues until 6 pm. Thus, the overall trend indicates an increase to midday followed by a decrease toward the evening.
Step 2
Suggest two factors that may affect the rate of photosynthesis during this 12 hour period.
Answer
- Light levels - The intensity and duration of sunlight directly influence the photosynthesis rate.
- Temperature - The rate of photosynthesis can be affected by temperature variations throughout the day.