Tag: improved methods of agriculture

Questions Related to improved methods of agriculture

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

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  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:

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  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.

Which of the following bacterium is used as a biopesticide?

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

  1. Bacillus cereus

  2. Bacillus thuringiensis

  3. Bacillus polymyxa

  4. Bacillus anthracis

Show answer
Correct Option: B
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.

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

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  1. Genetic control

  2. Biological control

  3. Artificial control

  4. Pesticidal control

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Correct Option: B
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'

Find the odd one out:

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  1. Rodents

  2. Birds

  3. Moisture

  4. Enzymes

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Correct Option: C
Explanation:

There are biotic and abiotic factors that damage the food materials. Moisture is the abiotic factor that damages the food material if it is raised to undesirable amount.

Stopage of reproduction in an organism by creating hurdle in its biology or physiology or its distraction by use of another organism is known as

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

  1. Predation

  2. Competition

  3. Biological control

  4. Physiological control

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Correct Option: C
Explanation:

(c) Biological control methods include using natural predators of pests, using resistant varieties, crop rotation, etc.

Which one of the following is resistant to white rust disease

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

  1. Pusa Sem 2

  2. Pusa Komal

  3. Pusa Sawani

  4. Pusa Swarnim.

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Correct Option: D

When a natural predator (living organism) is applied on the other pathogen organisms to control them, this process is called as:

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

  1. Biological control

  2. Genetic engineering

  3. Artificial control

  4. Confusion technique

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Correct Option: A
Explanation:

Indiscriminate eradication of pests is undesirable because without them the beneficial predatory and parasitic organisms which depend upon them for food would also be eliminated. The biocontrol method of pest and pathogen control involves use of viruses, bacteria and other insects (which are their natural predators and pests).

In our country, vast tracts of forest are cleared and a single species of plant is cultivated. This practice promotes

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

  1. biodiversity in the area

  2. monoculture in the area

  3. growth of natural forest

  4. preserves the natural ecosystem in the area

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Correct Option: B