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Fertilizers are materials which supply only nitrogen to the soil.

evs - i food for all improved methods of agriculture receding water table water conservation and irrigation

  1. True

  2. False

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Correct Option: B
Explanation:

Fertilizers are materials which supply essential elements to the plants through soil.

They are of various types like
$\bullet$ NPK Fertilizer
$\bullet$ Comound fertilizers, etc.
They can supply Nitrogn, Phosphorous, Potassium to the soil.

The key element delivered in soil fertilizer is:

evs - i food for all improved methods of agriculture receding water table water conservation and irrigation

  1. carbon

  2. nitrogen

  3. oxygen

  4. neon

  5. argon

Show answer
Correct Option: B
Explanation:

The key element required for plants in the soil is nitrogen, phosphorous and potassium. So, it is delivered in form of fertilizers.

They key element derived in soil fertilizer is Nitrogen fertilizer.

The traces of these element is required for the plant's growth. These are:

evs - i food for all improved methods of agriculture receding water table water conservation and irrigation

  1. iron and silver

  2. calcium and plutonium

  3. nitrogen and nickel

  4. iron and manganese

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Correct Option: D
Explanation:

Trace elements:-

Iron(Fe)- assists in the manufacture of chlorophyll and other biochemical processes.
Manganese(Mn)- is needed for chlorophyll production.

An example for nitrogenous fertilizer is _________.

evs - i food for all improved methods of agriculture receding water table water conservation and irrigation

  1. super phosphate

  2. urea

  3. potassium sulphate

  4. potassium chloride

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Correct Option: B
Explanation:

Examples of nitrogenous fertilizers:-

1) Nitrate fertilizers
2) Ammonium fertilizers
3) Nitrate and ammonium fertilizers
4) Amide fertilizers
   (i)Urea- It is slightly acidic in nature. Urea application to soil creates a small loss of calcium from the soil. Urea is highly concentrated nitrogenous fertilizer containing 46% nitrogen.
   (ii)Calcium Cyanamide- It is non-leachable, synthetic organic fertilizer. Its basicity (alkalinity) is three times as high as that of sodium nitrate and advisable for use on acid soils.

Symbols of the most essential elements required for the development of all the plants are:

evs - i food for all improved methods of agriculture receding water table water conservation and irrigation

  1. $N, P, K$

  2. $S, Pb, K$

  3. $K, Cu, F$

  4. $P, Ca, Pt$

Show answer
Correct Option: A
Explanation:

The most essential elements required for the development of all plants are:-

1. Nitrogen (N)
2. Phosphorous (P)
3. Potassium (K)

The leaves die out early is due to the deficiency of: 

evs - i food for all improved methods of agriculture receding water table water conservation and irrigation

  1. nitrogen

  2. phosphorous

  3. potassium

  4. iron

Show answer
Correct Option: A
Explanation:

Because of the nitrogen deficiency following things happens:-

1. Plants growth is stunted and poorly developed(because protein content, cell division, and cell enlargement are decreased) 
2. It causes yellowing (chlorosis) of leaves, Older leaves are affected first.
3. Flowering and fruiting are reduced.
4. Protein and starch content is decreased.
5. Prolonged dormancy and early senescence appear.

Name the most important elements required for a plant growth.

evs - i food for all improved methods of agriculture receding water table water conservation and irrigation

  1. potassium , nitrogen, and phosphorus

  2. nitrogen , mercury and hydrogen

  3. zinc , lead and mercury

  4. oxygen , iodine and potassium

Show answer
Correct Option: A
Explanation:

 The most important elements that plants need, without which they won't thrive, are the three macronutrients: potassium, nitrogen, and phosphorus. Because they are basic building blocks of every plant are ATP, cell membranes and amino acids. Nitrogen is an element in every amino acid; ATP, which is the primary source of energy for all cells, contains phosphorus. Potassium is essential to a plant's ability to metabolize. This element also comprises up to two percent of a plant's weight.

So, the correct answer is 'Potassium, nitrogen, and phosphorus'.

In the manufacture of Superphosphate, bone ash is mixed with ___________.

evs - i food for all improved methods of agriculture receding water table water conservation and irrigation

  1. hydrochloric acid

  2. sulphuric acid

  3. nitric acid

  4. none of these

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Correct Option: B
Explanation:

Superphosphate is the chief material supplying phosphoric acid in fertilizer and may be considered the basis of the modern fertilizer industry. 

It is made by mixing of about equal weight of finely ground phosphate rock and sulphuric acid.

Greenhouse gas, which can be emitted from storage of nitrogen based fertilizers, is:

evs - i food for all improved methods of agriculture receding water table water conservation and irrigation

  1. nitrous oxide

  2. nitric oxide

  3. oxygen

  4. hydroxide

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Correct Option: A
Explanation:

Most nitrogen fertilizers contain nitrates which decompose slowly, in the presence of oxygen, to give harmful gases like nitrous oxide. 

Excess use of nitrogen fertilizers does not lead to:

evs - i food for all improved methods of agriculture receding water table water conservation and irrigation

  1. pest problems

  2. growth problems

  3. fruiting problems

  4. flowering problems

Show answer
Correct Option: A
Explanation:

1) Nitrogen fertilizers does not lead to pest problem but it leads to other bad causes to environment.

2) Excess nitrogen in the air can impair our ability to breathe, limit visibility and alter plant growth.  

3) Nutrient pollution is one of America's most widespread, costly and challenging environmental problems, and is caused by excess nitrogen and phosphorus in the air and water.