English

Increase in BOD in water leads to ______.

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Question

Increase in BOD in water leads to ______.

Options

  • increase in the dissolved O2 conc.

  • decrease in the dissolved O2 conc.

  • maintenance of dissolved O2 conc. at the same level

  • no effect on dissolved O2 conc

MCQ
Fill in the Blanks
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Solution

Increase in BOD in water leads to decrease in the dissolved O2 conc.

Explanation:

A higher BOD means decomposers consume more dissolved oxygen while breaking down organic matter. Therefore, dissolved oxygen decreases; it does not increase or remain unchanged.

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Chapter 20: Environmental Issues - EXERCISES [Page 1153]

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Sarita Aggarwal Biology [English] Class 12 ISC
Chapter 20 Environmental Issues
EXERCISES | Q I. 33. | Page 1153
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