Tag: the soil

Questions Related to the soil

The lower horizon of desert soil has deposits of ___________.

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

  1. Calcium

  2. Iron

  3. Potash

  4. Phosphorus

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Correct Option: A
Explanation:

Deserts soils are usually light coloured with minimal humus content due to which the plant productivity is low. Also the water retaining capacity is very less. However they are rich in minerals-calcium carbonate (caliche), gypsum, and/or salts.

A fertile soil, suitable for growing common crops is likely to have a pH value of _____________.

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

  1. three

  2. four

  3. six to seven

  4. nine to ten

Show answer
Correct Option: C
Explanation:
Soil pH is a measure of the acidity and alkalinity in soils. pH levels range from 0 to 14, with 7 being neutral, below 7 acidic and above 7 alkalines. The optimal pH range for most plants is between 5.5 and 7.0; however, many plants have adapted to thrive at pH values outside this range.

Arches, stacks and caves are formed by erosional features of ___________.

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

  1. Wind

  2. Waves

  3. Water

  4. Glaciers

Show answer
Correct Option: B
Explanation:

Caves, arches, stacks, and stumps are erosional features that are commonly found on a headland. Cracks are widened in the headland through the erosional processes of hydraulic action and abrasion. As the waves continue to grind away at the crack, it begins to open up to form a cave.

Which is responsible for sheet erosion? 

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

  1. Tree

  2. Air

  3. Water

  4. None of these

Show answer
Correct Option: C
Explanation:

  • Soil erosion is the loss of top fertile layer of soil either by wind or by water.
  • Sheet Erosion: Uniform removal of the top soil just like a sheet. It is resulted because of water flow.

In which type of formation does gypsum occur?

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

  1. Bed or layers

  2. Veins and lodes

  3. Results of evaporation in deserts

  4. Alluvial or placer deposits

Show answer
Correct Option: A
Explanation:

Gypsum can form anywhere where the right combination of mineral elements occurs and evaporation happens. It occurs as clumps of crystals or in thick beds. Gypsum beds were formed in shallow sea basins. These geologic areas are called evaporation basins because as the climate changed from tropic to arid the water evaporated concentrating the minerals it held. Gypsum formations can also occur in tidal flats along coastlines, in lagoons, deltas, hot springs, volcanic areas, desert water tables and even on plant roots.

Which of the following statements is incorrect?

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

  1. Cliffs are formed as a result of the wave erosion of the shores

  2. Beaches are formed by the deposition of material by waves along the shore

  3. Erosive action of the river is maximum in its upper course

  4. Process of deposition of material in the low lands is called gradation

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Correct Option: D

Weathering is the process of ______________________.

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

  1. Eating away of part of the surface of rocks

  2. Breaking up of rocks under the action of wind, water and changes in temperature

  3. Carrying away of eroded material

  4. Wearing away part of the earth's crust

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Correct Option: B

Mulching is associated with use of ________________.

geography exogenic processes part-2 the soil soil erosion (geo) soil erosion, soil conservation and uses of soil

  1. material to maintain soil moisture

  2. soil to build barrier.

  3. trenches to collect water.

  4. pilled up rocks to slow down the flow of water.

Show answer
Correct Option: A
Explanation:

A mulch is a layer of material applied to the surface of an area of soil. Its used for the following purposes:
1. to conserve moisture.
2. to improve the fertility of the soil.
3. to reduce weed growth.

It is important to make small check dams across the flooded gullies because they-
(i)   hold water for irrigation.
(ii)  hold water and prevent soil erosion.
(iii)  recharge ground water.

(iv)  hold water permanently.
Select the correct options from the above stated reasons-

geography exogenic processes part-2 the soil soil erosion (geo) soil erosion, soil conservation and uses of soil

  1. (i) and (iv)

  2. (ii) and (iii)

  3. (iii) and (iv)

  4. (ii) and (iv)

Show answer
Correct Option: B
Explanation:

A check dam is a small, often temporary, dam constructed across a swale, drainage ditch, or waterway to counteract erosion by reducing water flow velocity.

The most important cause of soil erosion is __________.

geography exogenic processes part-2 the soil soil erosion (geo) soil erosion, soil conservation and uses of soil

  1. Rain

  2. Wind

  3. Deforestation

  4. Overgrazing

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Correct Option: A