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The bar chart shows the presence of organisms in six lakes - Edexcel - GCSE Biology - Question 2 - 2015 - Paper 1
Question 2
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. (i) D... show full transcript
Worked Solution & Example Answer: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
As the pH of the lakes decreases, the number of species present also decreases. Specifically, many organisms are found at a pH of 6.0 and above, whereas fewer survive as the pH approaches 5.0 and below. For example, frogs are only present at the lowest pH of 4.0. This indicates that organisms thrive in more neutral conditions, suggesting that more acidic environments can lead to a reduction in species diversity.