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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ev207

Excess fertiliser washes from farmland into a lake and into the nearby groundwater. Select the correct statements.

  1. ANitrate and phosphate promote algal growth in the lake
  2. BThe dissolved oxygen at depth rises as algae decompose
  3. CHigh nitrate in drinking water can cause methaemoglobinaemia (blue baby syndrome) in infants
  4. DAdding still more nutrients reverses eutrophication

Answer: A, C

Nutrients feed algal blooms (A true). Their decay consumes, not adds, oxygen (B false). Nitrate in drinking water is converted to nitrite which reduces oxygen transport in infant blood (C true). More nutrients worsen eutrophication (D false).
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