NCERT Important Questions Class 9 Science biology Chapter 14
Important NCERT Extra Questions
Chapter 14 Natural Resources
NCERT Book Extra Questions for Session 2022-2023
CBSE Board and UP Board Others state Board
List main sources of water pollution.
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(i) Sewage; (ii) Industrial wastes; (iii) Synthetic soaps and detergents; (iv) Fertilizers and pesticides; (v) Petroleum; (vi) Heat.