Which one of the following elements is not an essential micronutrient for plant growth?

1. Mn

2. Zn

3. Cu

4. Ca

Subtopic:  Classification of Nutrients |
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A plant requires magnesium for

1. holding cells together

2. protein synthesis

3. chlorophyll synthesis

4. cell wall development

Subtopic:  Mineral Function |
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Farmers in a particular region were concerned that pre-mature yellowing of leaves of a pulse crop might cause decrease in the yield. Which treatment could be most beneficial to obtain maximum seed yield?

1. Frequent irrigation of the crop

2. Treatment of the palnts with cytokinins alongwith a small dose of nitrogenous fertilizer

3. Removal of all yellow leaves and spraying the remaining green leaves with 2, 4, 5 trichlorophenoxy acetic acid

4. Application of iron and magnesium to promote synthesis of chlorophyll

Subtopic:  Mineral Function |
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Sulphur is an important nutrient for optimum growth and productivity in:

1. pulse crops

2. cereals

3. fibre crops

4. oilseed crops

Subtopic:  Mineral Function |
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The function of leghaemoglobin is

1. to provide oxygen to leg muscles of nitrogen-fixing

2. to protect oxygen-sensitive enzymes of nitrogen fixing bacteria in the root nodules of

legumes

3. to walk to the sites where oxygen is required

4. to function when haemoglobin is not available.

Subtopic:  Genetics & Biochemistry of Nitrogen Fixation |
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Hydroponics is

1. cultivation of plants in water

2. growth of plants towards water

3. growth of plants away from water

4. soilless cultivation of plants

Subtopic:  Hydroponics & Aeroponics |
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The function of leghaemoglobin during biological nitrogen fixation in root nodules of legumes is to
1. convert atmospheric N2 to NH3
2. convert ammonia to nitrite
3. transport oxygen for activity of nitrogenase
4. protect nitrogenase from oxygen.

Subtopic:  Genetics & Biochemistry of Nitrogen Fixation |
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Which of the following is correct set of micronutrient for plants?

1. Mg, Si Fe, Cu Ca

2. Cu, Fe, Zn, B, Mn

3. Mg, Fe, Zn, B, Mn

4. Mo, Zn, Cl, Mg, Ca

Subtopic:  Classification of Nutrients |
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Which one of the following is not a microelement for plants?
(1) Cu

(2) B

(3) Zn

(4) Cr

Subtopic:  Classification of Nutrients |
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Leghaemoglobin is produced in response to

1. respiration 

2. photosynthesis

3. fatty acid synthesis

4. N2 fixation.

Subtopic:  Nodule formation | Nitrogen Metabolism: 1 | Nitrogen metabolism |
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