Which of the following element required by the plants is a micronutrient?

1. Phosphorus 2. Sulphur
3. Iron 4. Magnesium

Subtopic:  Criteria for Essentiality of Elements |
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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 H2PO4-or HPO42-
2. Nitrogen is obtained from the soil in the form of nitrates NO3- , nitrites NO2- and ammonium NH4+ salts
3. Sulphur is mainly obtained by plants as sulphur dioxide by foliar absorption
4. Boron is absorbed in the form of borate ions BO33-or B4O72-

Subtopic:  Mineral Function |
 82%
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Zn2+ is an activator of the enzyme:

1. RuBisCO 2. PEP carboxylase
3. Nitrogenase 4. Alcohol dehydrogenase
Subtopic:  Mineral Function |
 78%
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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
Subtopic:  Criteria for Essentiality of Elements |
 86%
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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
Subtopic:  Criteria for Essentiality of Elements |
 66%
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A plant requires magnesium mainly for:

1. DNA replication 2. Synthesizing enzymes
3. Synthesizing hormones 4. Synthesizing chlorophyll
Subtopic:  Mineral Function |
 85%
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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
Subtopic:  Mineral Function |
 77%
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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

Subtopic:  Mineral Function |
 88%
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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
Subtopic:  Mineral Deficiency & Toxicity |
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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 %
Subtopic:  Mineral Deficiency & Toxicity |
 90%
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