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Q. No.In biological nitrogen fixation by microbes:
I. Rhizobium fixes nitrogen in the root nodules of leguminous plants
II. Frankia fixes nitrogen in the root nodules of non-leguminous [actinorrhizal] plants
III. Mycorrhiza are symbiotic relation between vascular plants and fungi [genus Glomus] that help plants absorb minerals like phosphorus
IV. Cyanobacteria [Anabaena, Nostoc and Oscillatoria] serve as important biofertlizers in paddy fields
1. Only I, II and III are correct
2. Only I, II and IV are correct
3. Only II, III and IV are correct
4. I, II, III and IV are correct
Subtopic: Microbes as Biofertilizer |
77%
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Match each item in Column I with one in Column II and select the correct match from the codes given:
Codes
| COLUMN I | COLUMN II | ||
| A | LAB | P | Adds vitamin B12 to curd and stops the growth of diseases causing microbes in stomach |
| B | Propionibacterium shermanii | Q | Production of large holes in Swiss cheese |
| C | Saccharomyces cerevisiae | R | Derived from leaves of a plant, it is CNS stimulant and can cause hallucinations |
| D. | Aspergillus niger | S | Baker’s/Brewer’s yeast produces ethanol during fermentation |
| A | B | C | D | |
| 1. | Q | P | R | S |
| 2. | P | Q | S | R |
| 3. | R | S | Q | P |
| 4. | S | R | P | Q |
Subtopic: Microbes in Household Products | Chemicals, Enzymes & Other Bioactive Molecules |
94%
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In a sample of water polluted with sewage discharge, if you measure BOD [Biochemical Oxygen Demand] and DO [Dissolved Oxygen], you expect to find that:
| 1. | The levels of both BOD and DO are high |
| 2. | The levels of both BOD and DO are low |
| 3. | The levels of BOD will be high and the levels of DO will be low |
| 4. | The levels of BOD will be low and the levels of DO will be high |
Subtopic: Microbes in Sewage Treatment |
87%
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All the following are correct regarding Methanogens except:
| 1. | They can grow anaerobically on cellulosic material |
| 2. | They can produce large amounts of methane along with carbon dioxide and hydrogen |
| 3. | They can be found in anaerobic sludge during sewage treatment and in rumen of cattle |
| 4. | They are true bacteria and are chemoheterotrophs |
Subtopic: Microbes in Sewage Treatment |
81%
From NCERT
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Identify the correct statement:
| 1. | Roquefort cheese is ripened by a growing a specific bacterium on them |
| 2. | LAB improves the nutritional quality of curd by increasing Vitamin A |
| 3. | Aspergillus niger is used for commercial production of citric acid |
| 4. | Statins are used to lower blood glucose levels in IDDM |
Subtopic: Chemicals, Enzymes & Other Bioactive Molecules |
86%
From NCERT
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During secondary treatment of sewage water:
| I: | vigorous growth of useful aerobic microbes into flocs is allowed |
| II: | aerobic microbes consume the major part of the organic matter in the effluent. |
| III: | the BOD of the water sample gets significantly increased |
| 1. | Only I and II are correct |
| 2. | Only I is correct |
| 3. | Only II and III are correct |
| 4. | I, II and III are correct |
Subtopic: Microbes in Sewage Treatment |
68%
From NCERT
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| Assertion (A): | The organic farmer holds the view that eradication of pest is undesirable |
| Reason (R): | Biocontrol is not a good strategy to control pest |
| 1. | Both (A) and (R) are True and the (R) is the correct explanation of the (A) |
| 2. | Both (A) and (R) are True but the (R) is not the correct explanation of the (A) |
| 3. | (A) is True but (R) is False |
| 4. | Both (A) and (R) are False |
Subtopic: Microbes in Biocontrol Agent |
66%
From NCERT
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Consider the given two statements:
I. Glomus species cannot be cultured in the laboratory in the absence of a plant host.
II. Glomus species form symbiotic relationships (mycorrhizae) with plant roots.
1. Both I and Ii are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is incorrect but II is correct
4. I is correct but II is incorrect
I. Glomus species cannot be cultured in the laboratory in the absence of a plant host.
II. Glomus species form symbiotic relationships (mycorrhizae) with plant roots.
1. Both I and Ii are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is incorrect but II is correct
4. I is correct but II is incorrect
Subtopic: Microbes as Biofertilizer |
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Consider the two statements:
| I: | Biochemical oxygen demand (BOD) is often used as an indicator of the degree of organic pollution of water. |
| II: | An increase in BOD is used as a gauge of the effectiveness of wastewater treatment plants. |
| 1. | Only I is correct | 2. | Only II is correct |
| 3. | Both I and II are correct | 4. | Both I and II are incorrect |
Subtopic: Microbes in Sewage Treatment |
50%
From NCERT
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Lady beetles, and in particular their larvae, are voracious predators of:
| 1. | Aphids | 2. | Mosquito |
| 3. | Spider mites | 4. | Nematodes |
Subtopic: Microbes in Biocontrol Agent |
85%
From NCERT
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