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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. (a) (i) Describe the trend shown by the graph from 6 am to 6... 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 its peak at midday. After midday, there is a noticeable decline in the rate of photosynthesis, which continues until 6 pm. The graph reflects a clear trend where the rate rises in the morning, peaks in the early afternoon, and then decreases towards the evening.
Step 2
Suggest two factors that may affect the rate of photosynthesis during this 12 hour period.
Answer
- Light levels: The availability of sunlight directly influences the rate of photosynthesis, as plants require light for the process.
- Temperature: Optimal temperatures are necessary for enzymatic reactions involved in photosynthesis; too hot or too cold can reduce the rate.