Hydroponics cannot be used in the commercial production of vegetables such as

(1) Tomato

(2) Seedless cucumber

(3) Lettuce

(4) Pomegranate

Subtopic:  Introduction |
 89%
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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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 |
 85%
From NCERT
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The soil is enriched of dissolved ions and inorganic salts because of

(1) Raining

(2) Leaching

(3) Weathering

(4) Erosion

Subtopic:  Introduction |
 67%
From NCERT
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Which of the following is not true about soil?
P. Soil not only supplies minerals but also harbours nitrogen fixing bacteria and other microbes
Q. It holds water
R. It supplies air to the roots
S. It acts as a matrix that stabilises the plant
T. It is a source of photosynthate
U. It is positively geotropic without any exception

1. S, T and U
2. T and U
3. S and U
4. R and T

Subtopic:  Introduction |
 66%
From NCERT
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The soil is enriched of dissolved ions and inorganic salts because of

(1) Raining

(2) Leaching

(3) Weathering

(4) Erosion

Subtopic:  Introduction |
 78%
From NCERT
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Nitrogenase needs which of the following ion for activation?

(1) Cr

(2) Mo

(3) W

(4) Sg

Subtopic:  Criteria for Essentiality of Elements |
 96%
From NCERT
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For the opening and closing of stomata which of the following ion is important?

(1) Ca++

(2) Mo

(3) Cr

(4) K+

Subtopic:  Criteria for Essentiality of Elements |
 93%
From NCERT
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Alcohol Dehydrogenase needs which of the following ion for activation?

(1) Zn++

(2) Mo

(3) Cr

(4) Mg++

Subtopic:  Criteria for Essentiality of Elements |
 87%
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 |
 88%
From NCERT
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