Study the following statements and select the incorrect ones. (i) Physical removal of…
Biology · Class 12 · CBSE — Microbes in Human Welfare
Study the following statements and select the incorrect ones.
(i) Physical removal of large and small particles through filtration and sedimentation is called primary sewage treatment.
(ii) Secondary sewage treatment is mainly a mechanical process.
(iii) Activated sludge sediment in a sewage treatment plant is a rich source of aerobic bacteria.
(iv) Biogas, commonly called as gobar gas, is pure methane.
(i) Physical removal of large and small particles through filtration and sedimentation is called primary sewage treatment.
(ii) Secondary sewage treatment is mainly a mechanical process.
(iii) Activated sludge sediment in a sewage treatment plant is a rich source of aerobic bacteria.
(iv) Biogas, commonly called as gobar gas, is pure methane.
- (i) and (ii)
- (ii) and (iv)
- (ii) and (iii)
- (iii) and (iv)
Answer
(B) (ii) and (iv)
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