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Biology · 2024 · 3 marks
CBSE 2024 · Region 3 · Set 1 · Q26
(a) (i) List two major reasons for using cow-dung in a biogas plant instead of using domestic sewage. (ii) Mention one use of the unspent slurry of…
(a)(i)
List two major reasons for using cow-dung in a biogas plant instead of using domestic sewage.
(ii)
Mention one use of the unspent slurry of the biogas plant.
OR
(b)
Name the bioactive molecule and its microbial source generally used by physicians to treat the patients for :
(i)
Myocardial infarction
(ii)
High blood cholesterol level
(iii)
Organ transplantation
Marking-scheme solution
(a)(i)
-Cow dung has methanogens or Methanobacterium
-Cow dung is rich in cellulosic material
-Bacteria grows anaerobically on cellulosic material to produce large amount of
methane.
(ii)
Used as manure/ fertilizer (Organic)
OR
Bioactive molecule
Microbial source
(i)
Myocardial infarction
Streptokinase
Streptococcus
(ii)
High blood
cholesterol
level
Statins
Monoascus
purpureus
(iii)
Organ transplantation
Cyclosporin A
Trichoderma
polysporum
All Microbes in Human Welfare questions2024 question paperNCERT solutions: Microbes in Human WelfarePractice Microbes in Human Welfare →
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CBSE Class 12 Biology past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.