CBSE 12th Standard Biology Subject Microbes in Human Welfare HOT Questions 2 Marks Questions With Solution 2021
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CBSE 12th Standard Biology Subject Microbes in Human Welfare HOT Questions 2 Marks Questions With Solution 2021
12th Standard CBSE
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Reg.No. :
Biology
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Why some molecules are called bioactive molecules?Give two examples of such molecules.
(a) -
The dough/ batter out of which Dosa and idly is made, appears to be puffed when kept for some time. What thing is responsible for the puffy appearance? Can you tell the metabolic pathway responsible for giving this puffy appearance? Also, name the microorganism involved in this process?
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Different variety of cheese is known by their texture, flavors and taste. A variety of cheese is having “pores” in it. State the reason behind this. Name the microbe responsible for it. Also name the variety of cheese?
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Water samples, three in number namely river water; sewage water and secondary effluent from STP were subjected to BOD test. They were labeled A B & C but the laboratory technician did not note which was which. The BOD values of three samples A, B & C were recorded as 30mg/l, 8mg/l and 500mg/l respectively. Which sample of water is most polluted? Can you assign the correct label to each assuming the river water relatively clear?
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A white coloured, dry powdered substances is sprayed on the vulnerable plants to control butterfly caterpillars. Guess what thing of biological origin may be there in. What is the source /micro-organism of it?
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A bio- active molecule produced by micro-organism acts by competitively inhibiting the enzyme responsible for cholesterol synthesis. Name the enzyme and the microbe out of which it is extracted?
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A debate was going on the use of chemical fertilizer and bio-fertilizer. As a student of biology, you have strongly supported the use of bio fertilizer. Acquaint others in what way, you have supported this idea.
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By chance you have been caught by the neighboring country & you have been put with cattle. You have not only given human food to eat, but plentiful straw and green forage was there. As an intellectual student of biology, what thoughts would have come to your mind if you had eaten Straw?
(a) -
Assuming you as a chairman of KVIC, suggest the points of maximum utilization of Gobar Gas, the mechanism of its production & ecofriendly aspects of Gobar gas to the villages?
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Bottled fruit juices are clearer as compared to those at home. Explain
(a)
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CBSE 12th Standard Biology Subject Microbes in Human Welfare HOT Questions 2 Marks Questions With Solution 2021 Answer Keys
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Some molecules produced by certain living organisms perform functions in the body of other organisms and modify the metabolism.
Hence, they are called bioactive molecules.Statins and cyclosporin-A are bioactive molecules. -
i) Due to the production of CO2
ii) Anaerobic Respiration (Alcoholic Fermentation)
iii) Saccharomyces cerevisiae(yeast) -
i) Large amount of CO2 evolving through the cheese
ii) Microbe – A Bacterium - Propionibacterium sharmanii
iii) Swiss Cheese -
BOD value - 30mg/L - Secondary effluent from STP
BOD value - 8mg/L – River Water
BOD value - 500mg/L – Sewage Water
(Fact – The greater the BOD of water, the more is its pollution potential.) -
i) White powder is “Dry spores”
ii) Source – Bacillus thuringiensis bacteria -
i) Enzyme – Statins
ii) Microbe – yeast Monascus purpureus. -
Use of Biofertilizers instead of chemical fertilizers because:-
a) Chemical fertilizers cause pollution
b) Biofertilizers- no polution.
c) Biodegradable
d) Ecofriendly -
If I had been cow , I would have rumen , I would be able to eat straw which is a cellulosic material and digest it with the help of Methanogens ( Methane generating bacteria)
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Gobar gas can be abundantly produced in rural areas from gobar with the help of gobar gas plants. Slury acts as an exellent increase of soil fertility. Ecofriendly i.e. it does not cause pollution when burnt.
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1. The bottled fruit juices are clarified by the use of enzymes, pectinases and proteases, which would digest/degrade the pectins and protein respectively; hence they are clearer.
2. Those made at home are not clarified by any such enzyme.
