Q. No. is an activator of the enzyme:
1. RuBisCO
2. PEP carboxylase
3. Nitrogenase
4. Alcohol dehydrogenase
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An essential element categorized in elements that can alter the osmotic potential of a cell will be:
| 1. Nitrogen | 2. Phosphorus |
| 3. Molybdenum | 4. Potassium |
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Identify the element that is not obtained by terrestrial plants primarily from soil?
| 1. Potassium | 2. Nitrogen |
| 3. Phosphorus | 4. Carbon |
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A plant requires magnesium mainly for:
| 1. DNA replication | 2. Synthesizing enzymes |
| 3. Synthesizing hormones | 4. Synthesizing chlorophyll |
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Which of the following elements is a constituent of vitamins such as thiamine, biotin and Coenzyme A?
| 1. Calcium | 2. Sulfur |
| 3. Iron | 4. Phosphorus |
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The two elements required for splitting of water to liberate oxygen during photosynthesis are:
1. Manganese and Chlorine
2. Manganese and Boron
3. Copper and Chlorine
4. Molybdenum and Magnesium
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Identify the element required by plants for utilization of calcium and pollen germination:
| 1. Iron | 2. Sulfur |
| 3. Boron | 4. Zinc |
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The deficiency symptoms of which of the following tends to first appear in young tissues?
| 1. Nitrogen | 2. Potassium |
| 3. Calcium | 4. Magnesium |
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The deficiency of nitrogen or molybdenum can cause all except:
1. Chlorosis
2. Inhibition of cell division
3. Necrosis of leaf tissue
4. Delay in flowering
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Any mineral ion concentration is considered toxic to plants if it reduces the dry weight of tissues by:
| 1. 5 % | 2. 10 % |
| 3. 25 % | 4. 50 % |
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