AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
Textile/dyeing industry — discharges dyes into water bodies; Tanneries — discharge heavy metals like lead/mercury into rivers.
The question is 1 mark, so one line naming two industries with one pollutant each is sufficient. The passage explicitly lists textile and dyeing industries (dyes) and tanneries (heavy metals) as major culprits of water pollution. You may also use paper/pulp (acids), petroleum refineries (salts), or electroplating (heavy metals) — any two valid pairs from the passage earn full marks.