CBSE 12th Standard Biology Subject Microbes in Human Welfare Ncert Exemplar MCQ Questions 2021
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CBSE 12th Standard Biology Subject Microbes in Human Welfare Ncert Exemplar MCQ Questions 2021
12th Standard CBSE
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Reg.No. :
Biology
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Bio fertilisers include:
(a)Blue-green algae, rhizobia, other nitrogen fixing bacteria and mycorrhiza fungi
(b)Blue-green algae, rhizobia and other nitrogen fixings bacteria
(c)Rhizobia, other nitrogen fixing bacteria and mycorrhiza fungi
(d)Blue green algae, rhizobia and mycorrhiza fungi
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Methanogens, growing anaerobically on cellulosic material, produce
(a)Methane
(b)Methane and carbon dioxide
(c)Methane and hydrogen
(d)Methane, carbon dioxide and hydrogen.
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In fermentation of dough which is the main gas produced?
(a)Carbon dioxide
(b)Hydrogen
(c)Both (a) and (b)
(d)Methane
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The residue left after methane production from cattle dung is
(a)burnt
(b)burried in land fills
(c)used as manure
(d)used in civil construction
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Activated sludge should have the ability to settle quickly so that it can
(a)be rapidly pumped back from sedimentation to aeration tank
(b)absorb pathogenic bacteria present in waste water while sinking to the bottom of the settling tank
(c)be discarded and anaerobically digested
(d)absorb colloidal organic matter
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Which one is the most important role of microorganism of the well being of humans?
(a)sewage treatment
(b)production of methane
(c)production of SO2
(d)conversion of milk to curd
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Match the items in column 'A' and column 'B' and choose correct answer
Column 'A' Column 'B' (i) Lady bird (a) Methanobacterium (ii) Mycorrhiza (b) Trichoderma (iii) Biological control (c) Aphids (iv) Bio-gas (d) Glomus (a)(i)-(b), (ii)-(d), (iii)-(c), (iv)-(a)
(b)(i)-(c), (ii)-(d), (iii)-(b), (iv)-(a)
(c)(i)-(d), (ii)-(a), (iii)-(b), (iv)-(c)
(d)(i)-(c), (ii)-(b), (iii)-(a), (iv)-(d)
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BOD of waste water is estimated by ,measuring the amount of
(a)total organic matter
(b)biodegradable organic matter
(c)oxygen evolution
(d)oxygen consumption.
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The vitamin whose content increases following the conversion of milk into curd by lactic acid bacteria
(a)vitamin C
(b)vitamin D
(c)vitamin B12
(d)vitamin E.
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Which one of the following alcoholic drinks is produced without distillation?
(a)Wine
(b)Whisky
(c)Rum
(d)vitamin E.
1 Marks
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CBSE 12th Standard Biology Subject Microbes in Human Welfare Ncert Exemplar MCQ Questions 2021 Answer Keys
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(a)
Blue-green algae, rhizobia, other nitrogen fixing bacteria and mycorrhiza fungi
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(d)
Methane, carbon dioxide and hydrogen.
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(a)
Carbon dioxide
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(c)
used as manure
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(a)
be rapidly pumped back from sedimentation to aeration tank
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(a)
sewage treatment
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(b)
(i)-(c), (ii)-(d), (iii)-(b), (iv)-(a)
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(d)
oxygen consumption.
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(c)
vitamin B12
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(a)
Wine
1 Marks
