Tag: food for all

Questions Related to food for all

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

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

  1. Insecticides

  2. Pesticides

  3. Biofertilizers

  4. Weedicides

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Correct Option: D
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' .

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

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

  1. Seeds

  2. Weeds

  3. Fruits

  4. Flowers

Show answer
Correct Option: B
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' .

Which of the following is a weed?

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

  1. Wheat

  2. Rice

  3. Maize

  4. None of the above

Show answer
Correct Option: D

Assertion : Storage of seeds at low temperature is possible.

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

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

  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

Show answer
Correct Option: C
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'

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

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

  1. Opuntia

  2. Eichhornia

  3. Aphids

  4. Screw worm

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Correct Option: A

Which of the following weed should be eradicated quickly?

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

  1. Opuntia

  2. Eichhornia

  3. Parthenium

  4. Vallisneria

Show answer
Correct Option: C

Which of the following pesticides is an acetyl cholinestrase inhibitor?

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

  1. DDT

  2. Deltamethrin

  3. Malathion

  4. Permethrin

Show answer
Correct Option: C
Explanation:

Malathion is an organophosphate and an acetyl cholinestrase inhibitor that is strictly used as a topical pediculicide.

Correct answer-C

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

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

  1. Cyperus rotundus

  2. Eichhornia crassipes

  3. Trapa latifolia

  4. Trapa bispinosa

Show answer
Correct Option: B
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'

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.

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

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

  2. (iii) only

  3. (iii) and (iv)

  4. (i), (ii), (iii) and (iv)

Show answer
Correct Option: A
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.

Which of the following is a weed?

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

  1. Oryza sativa

  2. Cyperinus rotundus

  3. Arachis hypogea

  4. Triticum vulgare

Show answer
Correct Option: B
Explanation:

Weeds can be defined as the unwanted plants that are grown in the field and harm the desired crops. Cyperinus is the most invasive weed found throughout the world. It is the weed of rice field. This is the weed which is commonly found in the temperate regions.