Nitrogen-fixing nodules on the roots of non-leguminous plants like Alnus are produced by
1. Rhizobium
2. Beijernickia
3. Azotobacter
4. Frankia

Subtopic:  Nitrogen Fixation |
 89%
From NCERT
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For each molecule of ammonia produced by nitrogenase, the number of ATP molecules required are:
1. 4
2. 8
3. 12
4. 16

Subtopic:  Nitrogen Fixation | Ammonia Assimilation & Nitrogen Export |
 85%
From NCERT
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The deficiency symptoms of iron, magnesium and calcium in plants may actually be due to the toxicity of
1. Potassium
2. Manganese
3. Iron
4. Chlorine

Subtopic:  Mineral Deficiency & Toxicity |
 94%
From NCERT
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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 |
 93%
From NCERT
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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 |
 80%
From NCERT
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Which of the following is not related to Julius Von Sachs?

1. A prominent German Botanist
2. In 1860, he demonstrated for the first time that plants could be grown to maturity in a defined nutrient solution in the complete absence of soil
3. The technique, Hydroponics
4. Categorized the essential and non-essential mineral nutrition.

Subtopic:  Hydroponics & Aeroponics |
 85%
From NCERT
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Hydroponics can be used in

1. identification of essential elements

2. discovery of deficiency symptoms of essential elements

3. commercial production of vegetables

4. all of the above

Subtopic:  Hydroponics & Aeroponics |
 94%
From NCERT
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Hydroponics cannot be used in the commercial production of vegetables such as

(1) Tomato

(2) Seedless cucumber

(3) Lettuce

(4) Pomegranate

Subtopic:  Introduction |
 92%
From NCERT
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Which of the following is the essential requirement of Hydroponics?

(1) Aeration to obtain the optimum growth

(2) Lage vessel

(3) Broader neck

(4) Cotton plugs for funnel adjustment

Subtopic:  Introduction |
 83%
From NCERT
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How many elements are found in plants?

(1) 105

(2) 35

(3) 44

(4) More than 60

Subtopic:  Classification of Nutrients |
 76%
From NCERT
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