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2 (a) The bar chart shows the presence of organisms in six lakes - Edexcel - GCSE Biology - Question 2 - 2015 - Paper 1
Question 2
2 (a) The bar chart shows the presence of organisms in six lakes. Each lake has a different pH. The bars show if a particular organism is present at a certain pH. ... show full transcript
Worked Solution & Example Answer:2 (a) The bar chart shows the presence of organisms in six lakes - Edexcel - GCSE Biology - Question 2 - 2015 - Paper 1
Step 1
Describe how pH affects the variety of organisms in these lakes.
Answer
pH levels significantly influence the biodiversity of organisms in lakes. As the pH decreases, meaning the water becomes more acidic, the number of species tends to decrease as well. For instance, many species only thrive in specific pH ranges. According to the chart, it can be observed that most organisms are found in lakes with pH levels between 6.0 and 6.5, while the presence of certain species such as frogs is notably reduced in lakes with lower pH levels. This suggests that higher acidity can limit the variety of organisms that can survive in such conditions.
Step 2