Study the following statements and select the incorrect ones (i) Physical removeal of large and small particles through filtration and sedimentation is called primary sewage treamtent. (ii) Secondry sewage treatment is mainly a mechanical process (iii) Activated sludge sediment is a sewage treatement plant is a rich soruce of aerobic bactria.A. (i) and (ii)B. (ii) and (iv)C. (ii) and (iii)D. (ii) and (iv)

Study the following statements and select the incorrect ones (i) Physi

1.	Study the following statements and select the incorrect ones (i) Physical removeal of large and small particles through filtration and sedimentation is called primary sewage treamtent. (ii) Secondry sewage treatment is mainly a mechanical process (iii) Activated sludge sediment is a sewage treatement plant is a rich soruce of aerobic bactria.A. (i) and (ii)B. (ii) and (iv)C. (ii) and (iii)D. (ii) and (iv)
Answer» Correct Answer - B The stage in which biologial treatement of sewage is done is called secondary treatement. Biogas is mixture of gasses containing predominathly methane produced by micoorganism. Which may be used as fuel type of gas produced deopends on microbes and the organic substrae they utlize. Here the raw material is cellulose ahnd the gases produced are methane along with `CO_(2)` and `H_(2)`

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Arrange the following in the decreasing order (most important first) of their importance, for the welfare of human society. Give reasons for your answer. Biogas, Citric acid, Penicillin and Curd
Living organisms used to enrich the nutrient quality of the soil are called asA. bicontrol agentsB. biofertillsersC. synthetic fertilisersD. natural ferilisers
Biofertilisers areA. some bacteria and cyanobacteriaB. fertilisers formed by ploughing in barseemC. fertilisers obtained by decay of dead organismsD. fertilisers prepared by mixing cattle dung with crop residues.
Biofertilisers are prganisms that enrich the nutrient quality of the soil. Which of the following can be used as biofertilisers ?A. Nitrogen fixing cyanobacteriaB. Nitrogen fixing bacteriaC. MycorrhizaeD. All of these
Match the following and find the correcy combination A. a-ii, b-iv, c-i, d-iiiB. a-iii, b-i, c-iv, d-iiiC. a-v, b-i, c-iii, d-iiD. a-v, b-iv, c-i, d-ii
One of the free-living, anaerobic nitrogen-fixer is Or which of the following is a photoautotrophic bacteriumA. BeijerinckiaB. RhodospirillumC. RhizobiumD. Azotobacter
Variolation consisted ofA. Injecting viriolous matterB. Injecting heat-killed a viriolous matterC. Scratching an area over a vein and pour small matter from a small pox pustuleD. Scratching vein and pouring viriolous matter into blood.
The three microbes are listed below. Name the product produced by each one of them and mention their use. (a) Aspergillus niger (b) Trichoderma polysporum (c) Monascus purpureus
Make correction wherever you find mistake in spellings/words in the following paragraph/sentences. A. Biofertilisers are a high-cost output but they do not pollute the environment. Acceptability of biofertillisers is also low because they usually produce quick and spectacular results. B. Fungi of mycorrhiza solubilise phosphorus, produce plant growth inhibiting substance and protect host plants from soil nutrients. (C) Biopesticides are those chemical agents that are used for control of weeds. insects and pathogons.
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