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Q. No.Assertion (A): Nitrogenase is sensitive to oxygen hence an anaerobic condition is maintained for efficient nitrogen fixation.
Reason (R): High energy inputs for the cell to function demands high rates of aerobic respiration in the Kreb’s cycle and hence behaves as an oxygen scavenger
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Nodule formation |
53%
From NCERT
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All the following elements required by higher plants are regarded as ‘beneficial’ except:
1. Sodium
2. Selenium
3. Cobalt
4. Nickel
1. Sodium
2. Selenium
3. Cobalt
4. Nickel
Subtopic: Criteria for Essentiality of Elements |
67%
From NCERT
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Ammonia synthesis by nitrogenase requires a very high input of energy which is:
| 1. | 4 ATP for each NH3 produced |
| 2. | 8 ATP for each NH3 produced |
| 3. | 12 ATP for each NH3 produced |
| 4. | 16 ATP for each NH3 produced |
Subtopic: Nodule formation |
85%
From NCERT
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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 [Element] |
Column II [Role in plants] |
||
| A | Magnesium | P | Synthesis of auxin |
| B | Manganese | Q | Ribosome structure |
| C | Boron | R | Pollen germination |
| D | Zinc | S | Splitting of water |
| A | B | C | D | |
| 1. | Q | R | P | S |
| 2. | S | R | Q | P |
| 3. | Q | S | R | P |
| 4. | R | S | P | Q |
Subtopic: Mineral Function |
84%
From NCERT
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Nitrifying bacteria are:
1. chemoautotrophs
2. photoautotrophs
3. chemoheterotrophs
4. methanogens
1. chemoautotrophs
2. photoautotrophs
3. chemoheterotrophs
4. methanogens
Subtopic: Nitrogen metabolism |
78%
From NCERT
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In nitrogen cycle, the bacteria carrying out nitrification are:
1. Photosynthetic autotrophs
2. Chemoautotrophs
3. Chemoheterotrophs
4. Methanogens
1. Photosynthetic autotrophs
2. Chemoautotrophs
3. Chemoheterotrophs
4. Methanogens
Subtopic: Nitrogen metabolism |
84%
From NCERT
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Which essential mineral nutrient required by plants plays an important role in opening and closing of stomata?
1. Phosphorus
2. Potassium
3. Calcium
4. Magnesium
Subtopic: Mineral Function |
89%
From NCERT
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The main amino acid, from which the transfer of the amino group takes place and other amino acids are formed, is:
1. Glutamic acid
2. Aspartic acid
3. Tryptophan
4. Lysine
1. Glutamic acid
2. Aspartic acid
3. Tryptophan
4. Lysine
Subtopic: Nitrogen Fixation |
79%
From NCERT
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Nitrobacter:
1. Oxidises ammonia to nitrite
2. Reduces ammonia to nitrite
3. Oxidises nitrite to nitrate
4. Reduces nitrite to nitrate
1. Oxidises ammonia to nitrite
2. Reduces ammonia to nitrite
3. Oxidises nitrite to nitrate
4. Reduces nitrite to nitrate
Subtopic: Nitrogen Fixation |
71%
From NCERT
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In plants:
I. Iron is required for chlorophyll biosynthesis
II. Zinc is required for IAA biosynthesis
III: Boron is required for pollen germination
IV. Manganese is required for photolysis of water
1. Only I, II and III are correct
2. Only I, III and IV are correct
3. Only II, III and IV are correct
4. I, II, III and IV are correct
I. Iron is required for chlorophyll biosynthesis
II. Zinc is required for IAA biosynthesis
III: Boron is required for pollen germination
IV. Manganese is required for photolysis of water
1. Only I, II and III are correct
2. Only I, III and IV are correct
3. Only II, III and IV are correct
4. I, II, III and IV are correct
Subtopic: Mineral Function |
71%
From NCERT
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