Q41 / 200 · NEET 2023 (Manipur) · Botany

What will happen if fresh water lake gets contaminated by addition of polluted water with high BOD?

  • A
    Number of submerged aquatic plants in the lake will increase
  • B
    Number of aquatic animals in the lake will increase
  • Correct answer
    C
    Amount of dissolved oxygen in the lake will decrease
  • D
    The lake will remain unaffected

Solution

Higher BOD of water indicates higher amount of biodegradable organic materials present in it. Since BOD is inversely proportional to the dissolved oxygen (DO), therefore, the dissolved oxygen in the lake will decrease.

Hence, the correct answer is option: 'C'.

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