Biology 0610 · IGCSE · Pollution

Pollution — practice question

If the nitrate concentration in a lake rises, fish may die because of the events shown below. 1 greater aerobic respiration by decomposers 2 greater decomposition of dead producers 3 greater growth of producers 4 a decrease in dissolved oxygen Which sequence of events would result in the fish dying?

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

Worked solution & mark scheme

This 1-mark question has a full step-by-step worked solution and mark scheme.

  • Full mark scheme, point by point
  • Step-by-step worked solution
  • Write your answer & get it marked instantly by AI