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Conservation of Biodiversity · Paper 2 — Free Biology HL Practice Questions
1MasterySAQ-SHuman impact on ecosystems and biodiversity5 marksPaper 2~8 min
A population of sea turtles nests on a beach undergoing tourism development. The bar chart shows the number of successful nests (eggs hatched) from 2015 to 2025.
(a)
Describe the trend shown in the bar chart from 2015 to 2025. [1 mark]
(b)
Explain one human activity that could account for the decline in nesting success. [2 marks]
(c)
Calculate the average rate of decrease in successful nests per year over the period 2015 to 2025. [2 marks]
Solutions
2MasterySAQ-SHuman impact on ecosystems and biodiversity9 marksPaper 2~14 min
A factory releases sulfur dioxide () into the atmosphere, contributing to acid rain. The table shows the pH of rainwater collected at four sites at increasing distances from the factory.
Site — Distance from factory / km — Rainwater pH
A — 2 — 4.2
B — 5 — 4.5
C — 10 — 5.0
D — 20 — 5.6
Normal, unpolluted rainwater has a pH of approximately 5.6.
(a)
State the relationship between distance from the factory and rainwater pH. [1 mark]
(b)
Explain one consequence of acid rain for biodiversity in a lake ecosystem. [2 marks]
(c)
The pH scale is logarithmic; each whole-number change represents a tenfold change in hydrogen ion concentration . Calculate how many times more acidic the rainwater at Site A is compared to Site D. [2 marks]
(d)
Evaluate the use of rainwater pH alone as an indicator of the impact of pollution a lake ecosystem. [4 marks]
Solutions
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