Tag: biology

Questions Related to biology

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

After red gram, maize and corn are cultivated because _________________.

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

  1. They increase fertility of soil

  2. They fix $N _2$ in soil

  3. They enhance growth of plant

  4. They prevent disease caused by spotted bollworm

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Correct Option: A
Explanation:

Total dry matter and yield of maize, corn and red gram planted in soil have shown an increase in the soil fertility. Maize and corn not known to fix atmospheric nitrogen. Spotted bollworm affect the cotton plants and the gram, maize and cotton do not affect the pathogenesis. 


So, the correct answer is, 'They increase the fertility of soil'.

Rotation of crops helps in

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

  1. Insect control

  2. Altering chemical nature of soil

  3. Improving soil fertility and yield

  4. Proliferating weeds

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Correct Option: C
Explanation:
Crop rotation refers to the practice of growing different types of crops in the same area over a sequence of seasons. Different types of plants require different types of nutrients from the soil. Changing crops routinely allows the land to remain fertile, since not all of the same nutrients are being used each season. For example, planting a legume, such as soybeans, helps to replenish necessary nitrogen in the soil. Crop rotation has helped to increase productivity by replacing cultivated lands that has not been used for one or more seasons with growing different crops that replenish soil nutrients.

Which of the following can be an advantage of crop rotation?

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

  1. Crop rotation makes the soil fertile.

  2. Helps in the production of crop yield.

  3. Leguminous plants grown during crop rotation fix atmospheric nitrogen and enrich the soil with nitrogen compounds.

  4. All of the above.

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Correct Option: D
Explanation:

Crop rotation is the process of successive growing of crop in the same field. This helps in increasing the fertility of the soil. Helps in a good production of the crop. It decreases the population of pests. It also reduces soil erosion.

So, the correct option is 'All of the above'.

What benefits are obtained due to crop rotation?

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

  1. Increase in production

  2. Soil fertility

  3. Weed control

  4. All of the above

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Correct Option: D
Explanation:

Rotation of crops improves the fertility of the soil and hence, brings about an increase in the production of food grains. It helps in saving on nitrogenous fertilizers, because leguminous plants grown during the rotation of crops can fix atmospheric nitrogen in the soil with the help of nitrogen fixing bacteria. Rotation of crops help in weed control and pest control. Crop rotation adds diversity to an operation. 

__________ is the method of growing two or more crops simultaneously on same piece of land.

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

  1. Mixed cropping

  2. Intercropping

  3. Crop rotation

  4. Both A and B

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Correct Option: D
Explanation:

The method of growing two or more crops simultaneously on same piece of land is called mixed cropping or inter-cropping. This method helps in improving the fertility of soil.

Which of the following statements is not true?

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

  1. The rotation of crops improves the fertility of soil.

  2. The rotation of crops saves a lot of nitrogenous fertilisers.

  3. The rotation of crops helps in weed and pest control.

  4. The rotation of crops helps in the maintenance of nutrients in the soil.

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Correct Option: C
Explanation:

Crop rotation is a pattern of growing different types of crops in the same area. This method helps in the replenishment of nutrients by the regular succession of crops over the same field and enhances the health of crops. It minimizes the use of nitrogenous fertilizers. The nutrient quality of the soil can be maintained. There is no effect on the weeds and pests. 

Thus, the correct answer is option C. 

Rotation of crops is essential for

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

  1. Increasing the quantity of proteins

  2. Increasing the quantity of minerals

  3. Increasing fertility of the soil

  4. Getting different kinds of crops

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Correct Option: C
Explanation:

(c) If the same crop is grown year after year, fertility of soil is lost due to utilization of same minerals again and again. Soil fertility is usually maintained in the field by rotation of crops i.e., a crop is alternated by a leguminous crop.


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

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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

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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'.