Multiple choice general knowledge

What SPECIFC effect of eutraphication causes large numbers of fish to be killed?

  1. Increased levels of phospates

  2. Increased amounts of bacteria

  3. Decreased levels of dissolved oxygen

  4. Increased amounts of algae
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Eutrophication causes excessive algal growth. When these algae die and decompose, bacteria consume large amounts of dissolved oxygen. This oxygen depletion creates hypoxic conditions that suffocate fish, causing large-scale fish kills. While algae blooms and bacterial increases are part of the process, the direct killer is oxygen depletion.

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