Multiple choice

Which of the following is the result of eutrophication in a lake or pond?

  1. Water absorbs less light, and activate the certain aerobic bacteria.

  2. The level of nitrate and phosphate in the ecosystem increases.

  3. Depletion of oxygen level makes life in water impossible for fish and other living organisms thereby causing death.

  4. Aerobic bacteria depletes the oxygen level, thus only anaerobic bacteria can survive.

  5. Eutrophication in turn favours algal growth and cause algal bloom.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In a polluted pond, the bacteria flourish by depleting the oxygen content. Only the anaerobic bacteria can survive. Depletion of oxygen to such a great extent occurs that it makes life for other organisms impossible.

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