Q. No.The minimum amount of requirement for an element to be classified as a macronutrient for plants is:
1. 5 mmole of dry matter
2. 10 mmole of dry matter
3. 20 mmole of dry matter
4. 40 mmole of dry matter
1. 5 mmole of dry matter
2. 10 mmole of dry matter
3. 20 mmole of dry matter
4. 40 mmole of dry matter
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Which of the following element required by the plants is a micronutrient?
| 1. Phosphorus | 2. Sulphur |
| 3. Iron | 4. Magnesium |
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Identify the incorrect statement amongst the following:
1. Phosphorus is obtained by the plants from the soil in the form of phosphates
2. Nitrogen is obtained from the soil in the form of nitrates , nitrites and ammonium salts
3. Sulphur is mainly obtained by plants as sulphur dioxide by foliar absorption
4. Boron is absorbed in the form of borate ions
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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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