Which of the following represent nutrient levels in a water body? Choose the correct answer from the options given below.

1.Phototrophic

2.Eutrophic

3.Mesotrophic

4.Chemotrophic

5.Oligotrophic

A1, 3, 5 only

B1, 3, 4 only

C1, 2, 4 only

D2, 3, 5 only ✓ Correct

Correct answer: (D) 2, 3, 5 only

Explanation

Water bodies are graded by nutrient content as oligotrophic, mesotrophic and eutrophic.

Statement 2, eutrophic, marks nutrient-rich water and is a valid level.

Statement 3, mesotrophic, marks water with moderate nutrients and is a valid level.

Statement 5, oligotrophic, marks nutrient-poor water and is a valid level.

Statement 1, phototrophic, and Statement 4, chemotrophic, describe modes of nutrition, not the nutrient status of water.

Excess nutrients push a lake toward the eutrophic end, causing algal blooms.

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