Tag: evs - i

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

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

  1. Predation

  2. Competition

  3. Biological control

  4. Physiological control
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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

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

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

  1. Biological control

  2. Genetic engineering

  3. Artificial control

  4. Confusion technique
Reveal answer Fill a bubble to check yourself
A Correct answer
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).

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

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

  1. biodiversity in the area

  2. monoculture in the area

  3. growth of natural forest

  4. preserves the natural ecosystem in the area
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cultivating a single species of plant over a large area is the definition of monoculture, which typically reduces biodiversity compared to a natural forest ecosystem.