Tag: external forces - responsible for changes

Questions Related to external forces - responsible for changes

The reservoirs that are created on the flood plains also __________ the existing vegetation and soil leading to its decomposition over a period of time.

geography external forces - responsible for changes the soil soil erosion (geo) soil erosion, soil conservation and uses of soil

  1. Submerge

  2. Promotes

  3. Protects

  4. None of the above

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Correct Option: A
Explanation:

In recent years, multi-purpose projects and large dams have come under great scrutiny and opposition for a variety of reasons. Regulating and damming of rivers affect their natural flow causing poor sediment flow and excessive sedimentation at the bottom of the reservoir, resulting in rockier stream beds and poorer habitats for the rivers’ aquatic life. Dams also fragment rivers making it difficult for aquatic fauna to migrate, especially for spawning. The reservoirs that are created on the floodplains also submerge the existing vegetation and soil leading to its decomposition over a period of time.

Which one of the following soils is formed by capillary action?

geography external forces - responsible for changes the soil soil erosion (geo) soil erosion, soil conservation and uses of soil

  1. Regur -black cotton soil

  2. Grey and brown soil

  3. Red and black soil

  4. Saline and alkaline

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Correct Option: D
Explanation:
Saline and alkaline soils are also known as Usara soils. Various local names for saline soils are Reh, Kallar, and Chopan, Rakar, Thur, Karl etc. These soils have developed in areas with dry climatic conditions (in areas having a little more rainfall than the areas of desert soils) accompanied by lack of proper drainage. In this situation, salts of sodium, calcium and magnesium are deposited on the upper layer of the soil by capillary action.

Which of the following schemes are meant for preventing soil erosion?

geography external forces - responsible for changes the soil soil erosion (geo) soil erosion, soil conservation and uses of soil

  1. Contour bunding

  2. Control of cattle grazing

  3. Diversions

  4. Shifting cultivation

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Correct Option: A
Explanation:

Ploughing along contours on a slope prevents soil being washed away by rainwater or by surface run off. Contours act like bunds. Terraces are levelled into step like small fields with even slope.

Soil erosion caused by winds is high in the state of ______.

geography external forces - responsible for changes the soil soil erosion (geo) soil erosion, soil conservation and uses of soil

  1. Madhya pradesh

  2. Andhra pradesh

  3. Rajasthan

  4. Gujarat

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Correct Option: C
Explanation:

Wind erosion refers to the movement and deposition of soil particles by wind. It occurs when soil devoid of vegetation is exposed to high velocity of wind. Rajasthan is the region facing the highest levels of soil erosion due to the dry winds present in the region.

Which of the following method will not help in soil conservation?

geography external forces - responsible for changes the soil soil erosion (geo) soil erosion, soil conservation and uses of soil

  1. Contour Ploughing

  2. Strip cropping

  3. Creating shelter belts

  4. Ploughing up and down the slopes

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Correct Option: D
Explanation:

  • Soil conservation is a method of protecting soil from getting eroded either by wind or by water.
  • Soil erosion is also caused due to defective methods of farming. Ploughing in a wrong way i.e. up and down the slope form channels for the quick flow of water leading to soil erosion. 
  • The rest of the methods help in soil conservation.

Which type of soil develops due to high temperature and evaporation?

geography external forces - responsible for changes the soil soil erosion (geo) soil erosion, soil conservation and uses of soil

  1. Pair Soil

  2. Land Soil

  3. Arid Soil

  4. None of these

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Correct Option: C
Explanation:

Arid soils develop due to high temperature and evaporation.

Most desert soils are called Aridisols (dry soil). These are porous sandy soils with low nitrogenous matter and humus.

Terracing is an effective method of soil conservation in _____________.

geography external forces - responsible for changes the soil soil erosion (geo) soil erosion, soil conservation and uses of soil

  1. Hilly areas

  2. Desert areas

  3. Plain areas

  4. None of these

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Correct Option: A
Explanation:

On hilly slopes, terraces act as bunds and prevent the soil from being washed away by running water. 

Soil conservation is best achieved by _____.

geography external forces - responsible for changes the soil soil erosion (geo) soil erosion, soil conservation and uses of soil

  1. Wind screens

  2. Good plant covers

  3. Both a and b

  4. None of these

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Correct Option: B
Explanation:

  • Soil erosion is the loss of top fertile layer of soil either by wind or by water.
  • India is facing this problem in many parts. The area affected by soil erosion is 5, 00,000 square kilometres. It adversely affects productivity and economy of the country.
  • There are many techniques to prevent soil erosion. But important step is to increase planting of trees or afforestation.

Which one of the following crops is the most effective in controlling soil erosion?

geography external forces - responsible for changes the soil soil erosion (geo) soil erosion, soil conservation and uses of soil

  1. Cotton

  2. Gram

  3. Maize

  4. Pigeon peas

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Correct Option: B
Explanation:

Strip cropping is a method or farming in which more than one variety of crops are grown in different strips.

One of the important crop that is usually grown along with other crops is gram. This is because it has good soil holding capacity and prevents soil erosion.

Soils are usually formed by the process of ________.

geography external forces - responsible for changes the soil soil erosion (geo) soil erosion, soil conservation and uses of soil

  1. Weathering

  2. Deposition

  3. Denudation

  4. All of these

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Correct Option: D