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Human influences on the environment

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Question 26

The graphs show changes in the concentration of phosphate and light penetration depth measurements in a lake over a 20-year period from 2005 to 2025.

Two line graphs side-by-side. The left shows Phosphate concentration (µg/L) from 2005 to 2025, and the right shows Light penetration depth (m) over the same period.

a.

Describe the relationship between phosphate levels and light penetration depth over this 20-year period.

[2]
b.

Over this 20-year period, the population of arctic charr (a species of cold-water fish) in the lake decreased significantly. Explain how the changes in phosphate levels could cause this decrease in arctic charr population.

[6]

Human influences on the environment Questions

  1. IGCSE
  2. /Biology
  3. /Human influences on the environment