Question

Biochemical oxygen demand (BOD) is the amount of oxygen required (in ppm):

• A. For the photochemical breakdown of waste present in 1m3 volume of a water body.
• B. By anaerobic bacteria to break-down inorganic waste present in a water body.
• C. By bacteria to break-down organic waste in a certain volume of water sample.
• D. For sustaining life in a water body.

Answer 1

The correct option is C

By bacteria to break-down organic waste in a certain volume of water sample.

The Explanation for the correct option:

BOD also called biological oxygen demand, is the amount of dissolved oxygen needed by aerobic biological organisms to break down organic material present in a given water sample at a certain temperature.

The Explanation for the incorrect option:

It is not the photochemical breakdown of waste.

Biochemical oxygen demand (BOD) is not the amount of oxygen required by anaerobic bacteria to break-down inorganic waste present in a water body.

So, option (C) is correct.