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Q. No.To be considered as ‘toxic’, the mineral ion concentration in plants should reduce the dry weight of tissues by about:
1. 1 %
2. 2 %
3. 5 %
4. 10 %
Subtopic: Mineral Deficiency & Toxicity |
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Level 1: 80%+
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Regarding diazotrophs [biological nitrogen fixers]:
1. Frankia produces nitrogen-fixing nodules on the roots of non-leguminous plants
2. Azotobacter and Beijerinckia fix atmospheric nitrogen only as symbionts
3. Rhodospirillum is aerobic
4. No cyanobacteria are diazotrophs
1. Frankia produces nitrogen-fixing nodules on the roots of non-leguminous plants
2. Azotobacter and Beijerinckia fix atmospheric nitrogen only as symbionts
3. Rhodospirillum is aerobic
4. No cyanobacteria are diazotrophs
Subtopic: Nitrogen Fixation |
77%
Level 2: 60%+
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For plants the elements such as sodium, cobalt, silicon and selenium be best described as:
1. Beneficial elements
2. Toxic elements
3. Trace elements
4. Macronutrient elements
1. Beneficial elements
2. Toxic elements
3. Trace elements
4. Macronutrient elements
Subtopic: Criteria for Essentiality of Elements | Classification of Nutrients |
81%
Level 1: 80%+
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Bacteria capable of carrying out reduction of nitrate present in the soil include:
1. Pseudomonas and Thiobacillus
2. Nitrosomanas and Nitrobacter
3. Nitrococcus and Nitrococcus
4. Rhizobium and Bradyrhizobium
1. Pseudomonas and Thiobacillus
2. Nitrosomanas and Nitrobacter
3. Nitrococcus and Nitrococcus
4. Rhizobium and Bradyrhizobium
Subtopic: Nitrogen metabolism |
67%
Level 2: 60%+
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Which essential element required by plants is used in the synthesis of cell wall, formation of mitotic spindle and accumulates in older leaves?
1. Phosphorus
2. Magnesium
3. Calcium
4. Iron
1. Phosphorus
2. Magnesium
3. Calcium
4. Iron
Subtopic: Mineral Function |
86%
Level 1: 80%+
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Alnus can grow in nutrient-poor soils, where few other trees thrive, because of its association with nitrogen fixing bacterium:
1. Anabaena
2. Rhizobium
3. Azotobacter
4. Frankia
1. Anabaena
2. Rhizobium
3. Azotobacter
4. Frankia
Subtopic: Nitrogen Fixation |
78%
Level 2: 60%+
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Which element is an activator for the enzymes RuBisCo and PEP carboxylase?
1. Zinc
2. Magnesium
3. Potassium
4. Molybdenum
1. Zinc
2. Magnesium
3. Potassium
4. Molybdenum
Subtopic: Criteria for Essentiality of Elements |
81%
Level 1: 80%+
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Match List - I with List - II
Choose the correct answer from the options given below:
| List I | List II | ||
| (a) | Manganese | (i) | Activates the enzyme catalase |
| (b) | Magnesium | (ii) | Required for pollen germination |
| (c) | Boron | (iii) | Activates enzymes of respiration |
| (d) | Iron | (iv) | Functions in splitting of water during photosynthesis |
| (a) | (b) | (c) | (d) | |
| 1. | (iii) | (i) | (ii) | (iv) |
| 2. | (iii) | (iv) | (i) | (ii) |
| 3. | (iv) | (iii) | (ii) | (i) |
| 4. | (iv) | (i) | (ii) | (iii) |
Subtopic: Mineral Function |
72%
Level 2: 60%+
NEET - 2022
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Which one of the following produces nitrogen fixing nodules on the roots of Alnus ??
1. Beijernickia
2. Rhizobium
3. Frankia
4. Rhodospirillum
1. Beijernickia
2. Rhizobium
3. Frankia
4. Rhodospirillum
Subtopic: Genetics & Biochemistry of Nitrogen Fixation |
76%
Level 2: 60%+
NEET - 2022
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Which of the following is incorrect?
1. The inner boundary of the cortex, the endodermis, is impervious to water because of the presence of Casparian strip
2. The water movement through the root layers is ultimately symplastic in the endodermis
3. Pinus seeds cannot germinate and establish without the presence of mycorrhiza
4. The mycorrhizal fungi provides sugar and N-containing compounds to the plant root and in turn gets minerals and water from plant roots
1. The inner boundary of the cortex, the endodermis, is impervious to water because of the presence of Casparian strip
2. The water movement through the root layers is ultimately symplastic in the endodermis
3. Pinus seeds cannot germinate and establish without the presence of mycorrhiza
4. The mycorrhizal fungi provides sugar and N-containing compounds to the plant root and in turn gets minerals and water from plant roots
Subtopic: Nitrogen Metabolism |
64%
Level 2: 60%+
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