Tag: crop yield improvement

Questions Related to crop yield improvement

A nitrogen fixing microbe associated with the fern Azolla in rice fields is:

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

  1. Frankia

  2. Rhizobium

  3. Spirulina

  4. Anabaena

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Correct Option: D
Explanation:

Anabaena azollae, a cyanobacterium that lives in symbiotic association with the free-floating water fern Azolla. Anabaena azollae can grow Photo-autotrophically and fixes atmospheric nitrogen. The inoculation of cyanobacteria in rice crops significantly influences the growth of rice crop by secretion of ammonia in floodwater.

Which of the following is formed as a result of the use of quality breeds?

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  1. Producing higher yields in a shorter period of time

  2. Not requiring irrigation

  3. Increasing the lifespan of crops by 10 years

  4. Carrying out photosynthesis at night

Show answer
Correct Option: A
Explanation:

Quality breeds are the organism with improved quality or desired quality. It can be done by the breeding process like hybridization. The introduction of desired gene produce higher yields in a shorter time.

So, the correct answer is option A.

In India, the state famous for peanut cultivation is

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

  1. Gujarat

  2. Goa

  3. Punjab

  4. Tamil nadu

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Correct Option: A
Explanation:

Peanut is grown mostly in five states namely Andhra Pradesh, Gujarat, Tamil Nadu, Karnataka, and Maharashtra, and together they account for about 90 percent of the crop's total area. Two of these states (Andhra Pradesh and Gujarat) account for more than half of the cultivated area.

So, the correct option is 'Gujrat'.

A system of rotating crops with legume or grass pasture to improve soil structure and fertility is called

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

  1. Shifting agriculture

  2. Ley farming

  3. Contour farming

  4. Strip farming

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Correct Option: B
Explanation:

The process of growing of grass or legumes in rotation with grain or tilled crops as a soil conservation method is called Ley farming

So, the correct answer is 'Ley farming' 

Which of the following methods of cultivation makes soil fertile?

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  1. Excessive use of chemical fertilizers

  2. Extensive cultivation

  3. Crop rotation

  4. Monocropping

Show answer
Correct Option: C
Explanation:

Crop rotation is the practice of growing of different types of crops in alternate season. The cash crops grown in one season is replaced by leguminous plants in the other season. The nutrients which are used up by the previous crops are regained by the second crops. So, crop rotation maintains soil fertility and prevents soil erosion.

So, the correct answer is option C.

Monoculture is 

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

  1. Growing the same crop on the same soil after every two year

  2. Growing different crop on the same soil

  3. Growing the same crop on the same soil after every three year

  4. Growing the same crop on the same soil year after year

Show answer
Correct Option: D
Explanation:

Monoculture is the agricultural practice of producing or growing a single crop, plant, or livestock species, variety, or breed in a field or farming system for a time.

So the correct option is ' Growing the same crop on the same soil year after year'.

Rotation of crops is carried out to

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

  1. Increase convenience for the farmers

  2. Increase variation in the mineral content of soil

  3. Increase in nitrogen content of the soil

  4. Increase diversity of plant habitats

Show answer
Correct Option: B
Explanation:

The practice of growing a series of different types of crops in the same area in sequenced seasons is called crop rotation.
The advantages of crop rotation are:-
1) It helps in reducing soil erosion.

2) It increases soil fertility and crop yield.
3) The soil of farms do not get deficient of one type of nutrients.
So, the correct answer is 'Increase variation in the mineral content of soil'.

What are the adverse effects of using high yielding varieties of seeds?

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  1. They are expensive

  2. They are require lots of water for irrigation

  3. They have a low productivity.

  4. Both A and B

Show answer
Correct Option: D
Explanation:

Although the high yielding variety of seeds gave a huge amount of production, it has some disadvantages also. They require a lot of water in the field which leads to the decreasing water table. Also, the HYV seeds required higher production cost in terms of irrigation equipment. It also has an adverse effect on the environment, as HVY seeds require more fertilizer to be added to the soil for better production, which decreases the fertility of the soil.

All trees of a particular species were cut in a forest for making furniture. Which of the following acts wu be in favour of re-establishment of that forest?

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

  1. Planting trees of those species which were not found in that forest

  2. Planting trees of those species which are still present in that forest

  3. Planting trees of different species which were not present in that forest and show a high growth rate

  4. Planting trees of same species as many as that were cut in that forest

Show answer
Correct Option: B
Explanation:

  • If the deforested forest area is replaced with only one species of trees and all other vegetation is prevented from growing back then, a monoculture forest similar to agricultural crops will be the result.
  • However, the reforestation involves planting of different lots of seed of seedlings taken from the area, often of multiple species.
  • In those areas natural regeneration of a wide variety of plant and animal species that can occur.

Which of the following conditions are developed due to monoculture?

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

  1. Multiplication of parasites

  2. More food production

  3. Less use of toxic chemicals

  4. Ecosystem balance in undisturbed

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Correct Option: A