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 |
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Which of the following micronutrients does not form components of fertiliser?

(1) Cu, Mn

(2) Zn, K

(3) Fe, Cu

(4) Cu, Zn

Subtopic:  Classification of Nutrients |
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Which of the following macronutrients does not form components of fertiliser?

(1) N,P

(2) P,S

(3) K,S

(4) S,Zn

Subtopic:  Classification of Nutrients |
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Nitrogen:
Find the incorrect one.
1. Plants compete with microbes for it.
2. It is a limiting nutrient for both natural and agricultural ecosystem
3. Nitrogen has triple covalent bonds
4. Nitrogen fixation is conversion of nitrogen into nitrate

Subtopic:  Ammonia Assimilation & Nitrogen Export | Nitrogen Metabolism: 1 | Nitrogen metabolism |
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In nature, ……….. and ……….. provide enough energy to convert Nitrogen to nitrogen oxides (NO, NO2, N2O).

(1) Lightning, Forest fires

(2) Industrial combustions, UV radiation

(3) Forest fire, Lightning

(4) Lightning, UV radiation

Subtopic:  Ammonia Assimilation & Nitrogen Export | Nitrogen Metabolism: 1 | Nitrogen metabolism |
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Decomposition of organic nitrogen of dead plants and animals into ammonia is called

(1) Nitrogen Fixation

(2) Ammonification

(3) Nitrification

(4) Denitrification

Subtopic:  Ammonia Assimilation & Nitrogen Export |
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Electrical nitrogen fixation leads to

(1) Formation of Nitrate

(2) Formation of Nitrite

(3) Formation of Ammonia

(4) Formation of Nitrogen

Subtopic:  Nitrogen Metabolism: 1 | Nitrogen metabolism |
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Ammonia is first oxidized to nitrite by the bacteria except

(1) Nitrosomonas

(2) Nitrococcus

(3) Nitrobacter

(4) All of these

Subtopic:  Nitrogen Metabolism: 1 | Nitrogen metabolism |
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Nitrification does not include

(1) Conversion of ammonia to nitrite

(2) Conversion of nitrite to nitrate

(3) Conversion of nitrogen to ammonia

(4) Both B and C

Subtopic:  Nitrogen Metabolism: 1 | Nitrogen metabolism |
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The nitrifying bacteria are

(1) Photoautotroph

(2) Chemoautotroph

(3) Nitrotroph

(4) Organotroph

Subtopic:  Nitrogen Metabolism: 1 | Nitrogen metabolism |
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