Biology 0610 · IGCSE · Nutrient cycles

Nutrient cycles — practice question

A rise in the concentration of nitrates in water may cause fish to die because of eutrophication. Some stages in eutrophication are shown below. 1 increased aerobic respiration by decomposers 2 increased decomposition after the death of producers 3 increased growth of producers 4 a decrease in dissolved oxygen What is the correct order of these stages leading to the death of fish?

  • A$1 \rightarrow 4 \rightarrow 3 \rightarrow 2$
  • B$1 \rightarrow 2 \rightarrow 4 \rightarrow 3$
  • C$3 \rightarrow 2 \rightarrow 1 \rightarrow 4$
  • D$3 \rightarrow 4 \rightarrow 2 \rightarrow 1$

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