railway RRB JE (CBT I + CBT II) Mock Test 2024 People Development & Environment Environmental Issues Pollution
Major Sources of oxygen demanding waste in freshwater systems are
A. Agricultural run-off
B. Food Processing
C. Ore Mining
D. Sewage effluent
E. Landfill sites
Choose the correct options from these given below:
1
A, D and E
2
B, D and E
3
A, B and D
4
A, B, C and D