Tag: water conservation and irrigation

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

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

  1. iron and silver

  2. calcium and plutonium

  3. nitrogen and nickel

  4. iron and manganese
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Trace elements:-

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

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

An example for nitrogenous fertilizer is _________.

  1. super phosphate

  2. urea

  3. potassium sulphate

  4. potassium chloride
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. nitrogen

  2. phosphorous

  3. potassium

  4. iron
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

Name the most important elements required for a plant growth.

  1. potassium , nitrogen, and phosphorus

  2. nitrogen , mercury and hydrogen

  3. zinc , lead and mercury

  4. oxygen , iodine and potassium
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

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

  1. hydrochloric acid

  2. sulphuric acid

  3. nitric acid

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Excess use of nitrogen fertilizers does not lead to:

  1. pest problems

  2. growth problems

  3. fruiting problems

  4. flowering problems
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

Which of the following bacterium is used as a biopesticide?

  1. Bacillus cereus

  2. Bacillus thuringiensis

  3. Bacillus polymyxa

  4. Bacillus anthracis
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Bacillus thuringiensis, or Bt, is a soil bacterium. Thurioside is a toxin produced by the bacterium, Bacillus thuringenesis. It is used as a bioinsecticide. , when sprayed on plants, is toxic to certain pest insects. For years, farmers and home gardeners have used Bt as a microbial spray pesticide to control caterpillars, certain types of beetles, as well as mosquitoes and blackflies. 
Therefore, the correct answer is option B.
Multiple choice evs - i food for all improved methods of agriculture receding water table water conservation and irrigation

The use of a natural predation against another pathogenic organism is called as

  1. Genetic control

  2. Biological control

  3. Artificial control

  4. Pesticidal control
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The safest method of pest control is biological control. It involves the use of natural predators, parasites to prevent the growth of harmful pests like insects, mites by natural mechanism and active human control.
So, the correct answer is 'Biological control'