Tag: improved methods of agriculture

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Questions Related to improved methods of agriculture

Multiple choice evs whose forests? improved methods of agriculture cropping patterns food for all conservation of forest and wildlife wildlife deforestation and conservation

Which of the following is important to prevent the growth of weeds?

  1. Insecticides

  2. Pesticides

  3. Biofertilizers

  4. Weedicides
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Insecticides and pesticides are used to kill the insects and the pest that harm the crops . While biofetilizers are the manure (contains living microorganisms) . On the other hand , weedicides are used to kill the weeds .

So the correct option is 'Weedicides' .

Multiple choice evs whose forests? improved methods of agriculture cropping patterns food for all conservation of forest and wildlife wildlife deforestation and conservation

The unwanted plants that grow in a crop field are known as

  1. Seeds

  2. Weeds

  3. Fruits

  4. Flowers
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The unwanted plants in a crop field are known as weeds. These compete with the crop plants in the field for nutrition, hence hampering their growth. 

So, the correct option is 'Weeds' .

Multiple choice biology improvement in food resources improved methods of agriculture cropping patterns food for all

Assertion : Storage of seeds at low temperature is possible.

Reason : Respiration and enzymatic activity are not shown by seeds at low temperature.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion

  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion

  3. If the assertion is true but the reason is false

  4. If both the assertion and reason are false

  5. If the assertion is false but reason is true
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Some seeds are capable of withstanding exposure to low temperature (-10C to -20C). Some of properly dried seeds can withstand low temperature of even liquid nitrogen (- 196C). This reduces respiration and enzymatic activity to bare minimum which is required for sustaining the living of the seeds. Samples of the seeds are periodically tested for germination ability.

So, the correct answer is 'If the assertion is true but the reason is false'

Multiple choice evs whose forests? improved methods of agriculture cropping patterns food for all conservation of forest and wildlife wildlife deforestation and conservation

Cochineal insect has been used in checking the wild growth of________________.

  1. <p>Opuntia</p>

  2. <p>Eichhornia</p>

  3. <p>Aphids</p>

  4. Screw worm
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The cochineal insect (Dactylopius ceylonicus) was introduced to control the invasive growth of Opuntia (prickly pear cactus) in various regions.

Multiple choice evs whose forests? improved methods of agriculture cropping patterns food for all conservation of forest and wildlife wildlife deforestation and conservation

Which of the following weed should be eradicated quickly?

  1. Opuntia

  2. Eichhornia

  3. Parthenium

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

Parthenium hysterophorus is a highly invasive weed that spreads rapidly and poses significant health and agricultural risks. It is widely recognized as a major weed requiring urgent eradication efforts compared to the other options listed.

Multiple choice evs whose forests? improved methods of agriculture cropping patterns food for all conservation of forest and wildlife wildlife deforestation and conservation

American water plant that has become a troublesome water weed in India is

  1. Cyperus rotundus

  2. Eichhornia crassipes

  3. Trapa latifolia

  4. Trapa bispinosa
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Eichhornia crassipes , commonly known as water hyacinth , is an aquatic plant native to Amazon basin, known for it's highly problematic invasion outside it's native range. It forms dense mats in the water bodies, which causes the reduction in the oxygen for other organisms in the water body .

So the correct answer is 'Eichhornia crassipes'

Multiple choice evs whose forests? improved methods of agriculture cropping patterns food for all conservation of forest and wildlife wildlife deforestation and conservation

Given below are statements about the harmful effects of weeds on crop plants.
(i) They interfere while harvesting.
(ii) They help crop plants grow healthily.
(iii) They compete with crop plants for water, nutrients, space, and light.
(iv) They affect plant growth.
Choose the correct statements from above.

  1. (i), (iii) and (iv)

  2. (iii) only

  3. (iii) and (iv)

  4. (i), (ii), (iii) and (iv)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Harmful effects of weeds on crop of plant are as follows:
  • They interfere in harvesting.
  • They compete with crop plants for water, nutrients, space and light.
  • They affect plant growth.
  • Presence of weeds increases the cost of agriculture and hinders the progress of work.
  • It increases the irrigation requirement.
  • They reduce the value of produce or otherwise adds the cost of cleaning.
  • Some weeds when eaten (Cleome viscosa) by milch animals will produce an undesirable odour in the milk. At times death/disorder/deformity may occur.  For example, Datura stramonium.
  • The fruits and seeds of Xanthium strumarium and Achyranthes aspera entangle with wool which fetch lower prices.
  • They harbour insect pests, pathogens and parasites.
  • They reduce the value of the land.
  • Presence of weeds will impair the purity of varieties by chance of cross pollination.
  • Weeds cause health hazards to man and animals.
  • Weeds cause allelopathic effect.
Therefore, the correct answer is option A.