A) Industrial wastes
D) crop residues
Correct Answer: A
Solution :[a] Industries produce huge amount of waste which contains toxic chemicals and pollutants which can cause severe damage to us and our environment. They contain pollutants such as lead, mercury, sulphur, asbestos, nitrates and many other harmful chemicals. Many industries do not have proper waste management system and drain the waste in the fresh water which goes into rivers, canals and later in to sea. The toxic chemicals have the capability to change the colour of water, increase the amount of minerals, also known as Eutrophication, change the temperature of water and pose serious hazard to water organisms.
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