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Q. No.What specific role the symbiotic microbes like Rhizobium play in agriculture?
1.
They facilitate nitrogen absorption by the leaves of the plants
2.
They perform biological nitrogen fixation
3.
They carry out denitrification
4.
They enable plants to assimilate nitrogen efficiently
Subtopic: Microbes as Biofertilizer |
86%
From NCERT
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Mycorrhizal symbiotic fungi in plant roots primarily help in:
1. Nitrogen fixation
2. Phosphate absorption
3. Photosynthesis
4. Bicontrol
1. Nitrogen fixation
2. Phosphate absorption
3. Photosynthesis
4. Bicontrol
Subtopic: Microbes as Biofertilizer |
61%
From NCERT
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Mycorrhizal symbiotic fungi in plants commonly belong to the Genus:
1. Glomus
2. Philaphora
3. Byssoclamys
4. Paecilomyces
1. Glomus
2. Philaphora
3. Byssoclamys
4. Paecilomyces
Subtopic: Microbes as Biofertilizer |
97%
From NCERT
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Treatment of waste-water is done by the:
| 1. | heterotrophic microbes naturally present in the sewage. |
| 2. | photosynthetic autotrophic microbes naturally present in the sewage. |
| 3. | methanogens. |
| 4. | anaerobic microbes added as inoculum. |
Subtopic: Microbes in Sewage Treatment |
70%
From NCERT
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A small part of the activated sludge in sewage treatment plant is:
| 1. | pumped back into the aeration tank to serve as the inoculum. |
| 2. | added to the fresh water rivers. |
| 3. | is used to produce probiotics. |
| 4. | pumped into large tanks called anaerobic sludge digesters. |
Subtopic: Microbes in Sewage Treatment |
92%
From NCERT
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The large holes in the cheese shown below is due to fermentation carried out by:
1. Penicillium
2. Propionibacterium
3. Saccharomyces
4. Streptomyces
1. Penicillium
2. Propionibacterium
3. Saccharomyces
4. Streptomyces
Subtopic: Microbes in Household Products |
86%
From NCERT
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Consider the given two statements:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | Yeast (Saccharomyces cerevisiae) is used for commercial production of ethanol. |
| II: | Statins are produced by the yeast Monascus purpureus |
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: Chemicals, Enzymes & Other Bioactive Molecules |
91%
From NCERT
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Methanogenic bacteria are found in:
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
| I: | rumen of cattle | II: | activated sludge |
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic: Microbes in Production of Biogas |
66%
From NCERT
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The technology of biogas production from cow dung was developed in India largely due to the efforts of:
| 1. | Indian Renewable Energy Development Agency Limited |
| 2. | Oil and Natural Gas Commission |
| 3. | Indian Agricultural Research Institute and Khadi & Village Industries Commission |
| 4. | Indian Oil Corporation. |
Subtopic: Microbes in Production of Biogas |
98%
From NCERT
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If oxygen availability to activated sludge flocs in a sewage treatment plant is reduced:
| 1. | the rate of degradation of organic matter slows down |
| 2. | the center of flocs becomes anoxic, causing death of bacteria and eventually breakage of flocs. |
| 3. | the flocs would increase in size as anaerobic bacteria would grow around flocs. |
| 4. | Protozoa would grow in large numbers. |
Subtopic: Microbes in Sewage Treatment |
From NCERT
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