The criteria for essentiality of an element for a plant include all except:
1. It must be absolutely necessary for supporting normal growth and reproduction
2. The requirement must be specific and not replaceable by another element
3. It must be directly involved in the metabolism of the plant.
4. They must be present in the plants in a concentration in excess of 10 mmole/Kg of dry matter.

Subtopic:  Criteria for Essentiality of Elements |
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Which one of the following is not a nitrogen-fixing organism?

1. Anabaena

2. Nostoc

3. Azotobacter

4. Pseudomonas

Subtopic:  Nitrogen Fixation |
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Identify the incorrectly matched pair

    Mineral                     Functions in plants

1. Potassium                 Opening and closing of stomata, Activation of enzymes

2. Magnesium                Maintenance of ribosome structure, Structure of chlorophyll

3. Boron                        Pollen germination, Carbohydrate translocation

4. Molybdenum               Water splitting in photosynthesis, Nitrogen metabolism

Subtopic:  Mineral Function |
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How many ATP molecules are required to biologically fix one molecule of nitrogen into two molecules of ammonia?
1. 4
2. 8
3. 12
4. 16

Subtopic:  Genetics & Biochemistry of Nitrogen Fixation |
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When the plants are grown in magnesium deficient but urea rich soil, the symptoms expressed are:
1. yellowish leaves
2. colourless petiole
3. dark green leaves
4. shoot apex die.

Subtopic:  Mineral Deficiency & Toxicity |
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Select the mismatch.

(1) Frankia                      Alnus

(2) Rhodospirillium            Mycorrhiza

(3) Anabaena                   Nitrogen fixer

(4) Rhizobium                 Alfa-fa

Subtopic:  Nitrogen Fixation |
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Which is essential for the growth of root tip?
(1) Zn

(2) Fe

(3) Ca

(4) Mn

Subtopic:  Criteria for Essentiality of Elements |
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In which of the following, all three are macronutrients?
(1) Iron, copper, molybdenum

(2) Molybdenum, magnesium, manganese

(3) Nitrogen, magnesium, phosphorus

(4) Boron, zinc, manganese

Subtopic:  Classification of Nutrients |
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The oxygen evolved during photosynthesis comes from water molecules. Which one of the following pairs of elements involved in this reaction?

1. Manganese and chlorine

2. Manganese and potassium

3. Manganese and molybdenum

4. Magnesium and chlorine

Subtopic:  Mineral Function |
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Minerals known to be required in large amounts for plant growth include

1. Phosphorus, potassium, sulphur, calcium

2. calcium, magnesium, manganese, copper

3. potassium, phosphorus, selenium, boron

4. magnessium, sulphur, iron, zinc

Subtopic:  Classification of Nutrients |
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