Teaching CTET (Paper 1 & Paper 2) Mock Test Series 2025 General Science Biology Ecology & Environment
Which of these belong to the set of 'biological treatment processes' in a wastewater plant?
A) Aeration
B) Sand filtration
C) Chlorination
D) Use of anaerobic bacteria
1
A only
2
B and C
3
D only
4
A and D