Tag: improvement in food resources

Questions Related to improvement in food resources

Growing different crops in different seasons in the same field will deplete the soil of nutrients.

biology improvement in food resources crop yield improvement food supply crop improvement methods and organisations

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

The particular type of plants requires certain set of nutrients. For example, sugarcane requires a large amount of nitrogen. Also, some plants render the soil with some nutrients. For example, leguminous plants make soil nitrogen rich. 
If crop rotation is carried out then the soil will not deplete with certain nutrients. Hence, growing different crops in different seasons in the same field will be beneficial for economy as well as for soil quality too.

"Monoculture of commercially viable trees is destroying the unique natural profile of ___________ Thoughtless exploitation of timber, deforesting vast tracts for palm cultivation, destruction of mangroves, illegal logging by tribals and poaching only compound the problem. Fresh water packets are fast drying up due to deforestation and destruction of mangroves." The place referred to in this quotation is

biology improvement in food resources crop yield improvement food supply crop improvement methods and organisations

  1. Orissa coast

  2. Kerala coast

  3. Sunderbans

  4. Andaman and Nicobar Islands

Show answer
Correct Option: C
Explanation:

The Sundarbans is a mangrove zone in the delta shaped by the juncture of Ganges, In spite of safeguarding duties from the two Governments, the Sunderbans are under danger from both normal and human-made causes.

So, the correct option is 'Sunderbans'.

Cereals and legumes are cultivated alternatively in crop rotation process by a farmer. Which of the following are advantages of cultivating cereals and legumes alternatively?

biology improvement in food resources crop yield improvement food supply crop improvement methods and organisations

  1. When cereals are cultivated more nutrients are utilized

  2. If legumes are grown in the soil, less nutrients are utilized

  3. Legumes synthesize some nutrients as they have root nodules

  4. All of the above

Show answer
Correct Option: D
Explanation:
Cultivation of cereals followed legumes in a cultivated soil is called crop rotation. In this, Legumes have bacteria on nodules which are on the roots of the plant. The bacteria on the nodules takes nitrogen from the air and fixes it into the soil, so that other plants that require nitrogen can use it as well.  Farmers use soybeans and other legumes in rotations with grass crops such as corn or wheat. Grass crops are unable to take their own nitrogen from the air so they either need the nitrogen in the soil that the legumes provide for them in a crop rotation or they need a chemical fertilizer containing nitrogen. 
So the correct option is ' All of the above ' .

Which of the following is not a characteristic of mixed cropping?

evs improvement in food resources crop yield improvement food supply crop improvement methods and organisations

  1. Minimize risk of crop failure

  2. Set pattern of rows

  3. Harvesting and threshing crops separately is not possible

  4. Individual marketing and consumption of crop is not possible

Show answer
Correct Option: D
Explanation:

Mixed cropping is a type of cultivation in which two types of crops are grown at a time and in the same piece of land. It is a form of polyculture. The characteristic of mixed cropping is balancing the nutrient level on soil, suppression of weed and insect pests, minimize the risk of crop failure etc.

So, the correct option is 'Individual marketing and consumption of crop is not possible'.

Gundhi bug is a pest of 

biology improvement in food resources crop yield improvement food supply crop improvement methods and organisations

  1. rice

  2. mustard

  3. wheat

  4. groundnut.

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Correct Option: A
Explanation:

Gundhi bug is a pest of rice. Its a small insect which attacks the ripening rice grains and make wither away. It sucks the milk from developing grains and stem in early stage of grain formation which causes foul smell in the field.

The method of growing different crops alternatively on same piece of land is called _______________.

evs improvement in food resources crop yield improvement food supply crop improvement methods and organisations

  1. Mixed cropping

  2. Multiple cropping

  3. Rotation cropping

  4. Inter cropping

Show answer
Correct Option: C
Explanation:

The method of growing different crops alternatively on same piece of land is called rotation cropping. This helps in maintaining or improving the fertility of soil.

Improper use of land converts fertile land into unusable land.

evs improvement in food resources crop yield improvement food supply crop improvement methods and organisations

  1. True

  2. False

  3. Nither

  4. Either

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Correct Option: A

In breeding a new genetic variety of a crop by hybridisation, superior recombinants are self pollinated for several generations till they reach a state of 

biology improvement in food resources crop variety improvement improvement if crop varieties improvement in crop variety

  1. Uniformity

  2. Heterozygosity

  3. Homozygosity

  4. Both (1) and (3)

Show answer
Correct Option: D
Explanation:

After the hybridization of two selected parent plant species, the recombinants with the desired combination of characters are selected. These hybrids are then self-pollinated for several generations so that they reach a state of uniformity or homozygosity so that the desired characters will not segregate in the progeny.

(Uniformity and Homozygosity are synonymous for the state of possessing two similar alleles for the same genes, one acquired from each parent.)
So, the correct answer is 'Uniformity' and 'Homozygosity'.

An improved insect resistant variety "Pusa Gaurav" is variety of _________

biology improvement in food resources crop variety improvement improvement if crop varieties improvement in crop variety

  1. Brassica

  2. Flat bean

  3. Cow pea

  4. Bhindi

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Correct Option: A
Explanation:

Pusa Gaurav is an insect resistant variety of Mustard or Brassica that shows resistant against the aphids.

Hence, the correct answer is 'Brassica'

Calculate the amount of $(NH _4) _2SO _4$ in $'g'$ which must be added to $500ml$ of $0.2\,M\,NH _3$ to yield a solution of $pH=9.35$ given $p^{k _b} (NH _3)=4.74$.(Given $10^{-0.09}=0.812$)

biology improvement in food resources crop variety improvement improvement if crop varieties improvement in crop variety

  1. $8\,g$

  2. $5.36\,g$

  3. $4.55\,g$

  4. $4.0\,g$

Show answer
Correct Option: A