Question

Increase in BOD in water leads to ______.

विकल्प

• 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

Answer 1

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.