An element that is labeled as ‘essential’ for plants is characterized by all the following except:
1. Its deficiency cannot be met by supplying some other element
2. It allows normal vegetative growth but does not allow seed set, if absent
3. Its requirement must be specific
4. It must be directly involved in the metabolism of the plant

Subtopic:  Criteria for Essentiality of Elements |
 76%
From NCERT
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The minimum amount of requirement for an element to be classified as a macronutrient for plants is:
1. 5 mmole kg-1 of dry matter
2. 10 mmole kg-1 of dry matter
3. 20 mmole kg-1 of dry matter
4. 40 mmole kg-1 of dry matter

Subtopic:  Criteria for Essentiality of Elements |
 87%
From NCERT
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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 |
 79%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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 |
 85%
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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