Read the given passage carefully and answer the questions that follow :
Water Pollution
Industries produce several undesirable products including industrial
wastes, polluted waste water, poisonous gases, chemical residuals,
numerous heavy metals, dust, smoke, etc. Most of the industrial wastes
are disposed off in running water or lakes. Consequently, poisonous
elements reach the reservoirs, rivers and other water bodies, which
destroy the bio-system of these waters. Major water polluting industries
are leather, pulp and paper, textiles and chemicals.