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The vitamin whose content increases following the conversion of milk into curd by lactic acid bacteria is
(c) The vitamin \(\mathrm{B}_{12}\) content increases following the conversion of milk into curd by lactic acid bacteria (LAB).
Wastewater treatment generates a large quantity of sludge, which can be treated by
(a) Wastewater treatment generates a large quantity of sludge, which can be treated by anaerobic sludge digesters.
Methanogenic bacteria are not found in
(d) Methanogenic bacteria are found in rumen of cattle, gobar gas plant and bottom of,waterlogged paddy fields.
The primary treatment of waste water involves the removal of
(b) 10 treatment basically involves physical removal of particles from sewage through: (i) Filtration and (ii) Sedimentation
These are removed in stages:
(i) Initially floating debris is removed by sequential filtration.
(ii) Then the grit (soil and pebbles) are removed by sedimentation
BOD of waste water is estimated by measuring the amount of
d) BOD of waste water is estimated by measuring the amount of oxygen consumption.
Which one of the following alcoholic drinks is produced without distillation?
(a) Wine and beer are produced, without distillation. Whisky, brandy and rum are produced by distillation.
The technology of biogas production from cow dung was developed in India largely due to the efforts of
(c) The technology of biogas production from cow dung was developed in India largely due to the efforts of Indian Agricultural Research Institute and Khadi and Village Industries Commission.
The free-living fungus Trichoderma can be used for
(b) The free-living fungus Trichoderma can be used for biological control of plant diseases.
What would happen if oxygen availability to activated sludge floes is reduced?
(b) If oxygen availability to activated sludge floes is reduced the center of floes will become anoxic, which would cause death of bacteria and eventually breakage of floes.
Mycorrhiza does not help the host plant in
(d) Mycorrhiza help the host plant in enhancing its phosphorus uptake capacity, increasing its tolerance to drought and enhancing its resistance to root pathogens.
Which one of the following is not a nitrogen-fixing organism?
(d) Anabaena, Nostoc and Azotobacter are the cyanobacteria. All are nitrogen-fixing organism.
Big holes in Swiss cheese are made by a
(c) Large holes in Swiss cheese are due to production of large amount of C02 by a bacterium named Proponibacterium sharmanii.
The residue left after methane production from cattle dung is
(c)
– Thus gobar (excreta/dung) of cattle is rich in these bacteria. Dung can be used for generation of biogas, commonly called gobar gas.
– The residue left after methane production from cattle dung is used as manure.
Methanogens do not produce
(a) Methanogens are obligate anaerobes, which produce methane, hydrogen sulfide and carbon dioxide but do not produce oxygen.
Activated sludge should have the ability to settle quickly so that it can
(a) Activated sludge should have the ability to settle quickly so that it can be rapidly pumped back from sedimentation tank to aeration tank.
Match the following list of bacteria and their commercially important products:
\(
\begin{array}{|l|l|}
\hline \text { Bacterium } & \text { Product } \\
\hline \text { A. Aspergillus niger } & \text { i. Lactic acid } \\
\hline \text { B. Acetobacter aceti } & \text { ii. Butyric acid } \\
\hline \text { C. Clostridium butylicum } & \text { iii. Acetic acid } \\
\hline \text { D. Lactobacillus } & \text { iv. Citric acid } \\
\hline
\end{array}
\)
Choose the correct match:
(c) A-iv, B-iii, C-ii, D-i
Match the following list of bioactive substances and their roles:
\(
\begin{array}{|l|l|}
\hline \text { Bioactive Substance } & \text { Role } \\
\hline \text { A. Statin } & \text {i. Removal of oil stains } \\
\hline \text { B. Cyclosporin A } & \text { ii. Removal of clots from blood vessels } \\
\hline \text { C. Streptokinase } & \text { iii. Lowering of blood cholesterol } \\
\hline \text { D. Lipase } & \text { iv. Immuno-suppressive agent } \\
\hline
\end{array}
\)
(d) A-iii, B-iv, C-ii, D-i
Match the items in Column ‘A’ and Column ‘B’ and choose correct answer.
\(
\begin{array}{|l|l|}
\hline \text { Column I } & \text { Column II } \\
\hline \text { A. Lady bird } & \text { i. Methano bacterium } \\
\hline \text { B. Mycorrhiza } & \text { ii. Trichoderma } \\
\hline \text { C. Biological control } & \text { iii. Aphids } \\
\hline \text { D. Biogas } & \text { iv. Glomus } \\
\hline
\end{array}
\)
The correct answer is:
(b) A-iii, B-iv, C-ii, D-i
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