The following terms are constantly seen in relation to environmental pollution. Which of them is/are correct?
1. Biochemical Oxygen Demand (BOD) measures the amount of oxygen required by microorganisms for the decomposition of biodegradable matter under aerobic conditions.
2. Chemical Oxygen Demand (COD) measures both biodegradable and non-biodegradable pollutants present in the wastewater.
Select the correct answer from the codes given below.1
1 only
2
2 only
3
Both 1 and 2
4
Neither 1 nor 2