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Environmental Chemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryEnvironmental Chemistry1 Mark
MCQ
Phosphate containing fertilisers cause water pollution. Addition of such compounds in water bodies causes $ ..........$
  • ✓
    Enhanced growth of algae.
  • B
    Decrease in amount of dissolved oxygen in water.
  • C
    Deposition of calcium phosphate.
  • D
    Increase in fish population.
✓

Answer

Correct option: A.
Enhanced growth of algae.
Fertilizers containing phosphate present in water help in the excessive growth of aquatic plants and algae. Micro $-$ organisms which decompose these plants consume oxygen. As a result, the amount of dissolved oxygen in the water decreases.

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