Tag: soil pollution and its effects

Questions Related to soil pollution and its effects

A soil is said to be fertile when 

biology properties of natural resources properties of soil soil pollution and its effects soil and soil pollution

  1. It is rich in organic matter

  2. It has capacity to hold water

  3. It has a capacity to hold nutrients

  4. It holds water and all essential nutrients in a definite proportion

  5. All of the above

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Correct Option: E
Explanation:

Fertile soil has the following characteristics: 

1. It is rich in nutrients necessary for basic plant nourishment. This includes nitrogen, phosphorus and potassium. It consists of adequate minerals such as boron, chlorine, cobalt, copper, iron, manganese, magnesium, molybdenum, sulphur and zinc. These minerals promote plant nutrition. 
2. It contains soil organic matter, that improves the structure of the soil. This enables the soil to retain more moisture. The soil pH is in the range 6.0 to 6.8. 
3. It has a good soil structure, which results in well-drained soil. 
4. It consists of a variety of microorganisms, that support plant growth. It often contains large amounts of topsoil.

Soil carried by gravity is

biology properties of natural resources properties of soil soil pollution and its effects soil and soil pollution

  1. Alluvial

  2. Eolian

  3. Colluvial

  4. Glacier

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Correct Option: C
Explanation:

Colluvial soil is made of materials of all sizes (from boulders to clay), that accumulate at the bottom of steep slopes and cliffs without the help of streams. 

Sheet wash during rain storms and gravity are responsible for depositing this type of soil. Wheat is the main crop grown in colluvial soil. When the velocity of running water decreases, the heaviest particles are deposited on a riverbed. The finest particles (gravel, silt, sand, and clay) are deposited at the mouth of the river, forming a delta made of alluvial soil. 
Eolian sediments are wind deposited materials that consist primarily of sand or silt-sized particles. Glaciers are made up of fallen snow that, over many years, compresses into large, thickened ice masses.

Soil fertility is determined by its ability to

biology properties of natural resources properties of soil soil pollution and its effects soil and soil pollution

  1. Decay organic matter

  2. Hold organic matter

  3. Retain nutrients

  4. Support life

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Correct Option: D
Explanation:

Soil fertility is the ability of the soil to supply essential plant nutrients and soil water in adequate amounts for plant growth and reproduction, thereby support life. Thus the correct answer is option D.

Alluvial soil is mostly found in which region

biology properties of natural resources properties of soil soil pollution and its effects soil and soil pollution

  1. Southern India

  2. Northern India

  3. Gangetic Jamuna Plains

  4. Eastern India

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Correct Option: C
Explanation:
Alluvial soil covers about 40 percent of land area of India. It is depositional soils that are transported and deposited by rivers and stream formed by deposition of fine sediments and silt by the rivers along their banks. Such soil is mostly found in the Great Northern Plains of the river Ganga. Thus the correct answer is option C.

A fertile soil is likely to have a pH value of

biology properties of natural resources properties of soil soil pollution and its effects soil and soil pollution

  1. 3.5-4

  2. 8.5-9

  3. 5.5-7

  4. 10.5-11

Show answer
Correct Option: C
Explanation:

Fertile soil contains sufficient minerals and nutrients needed for plant growth. Most minerals and nutrients are more soluble in slightly acidic soil than in neutral or slightly alkaline soils. The pH range of 5.5-7 is highly suitable for plant growth and hence such a soil is considered fertile. Thus the correct answer is option C.

The best soil for healthy and vigorous growth of most plants is

biology properties of natural resources properties of soil soil pollution and its effects soil and soil pollution

  1. Sandy soil

  2. Loam soil

  3. Clay soil

  4. None of these

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Correct Option: B
Explanation:

Loam soil is a soil that has a good combination of minerals, rock, sand, silt water and organic matter. The soil contains microorganisms, insects and worms that replenish soil fertility. Because of this good composition, it is the healthiest type of soil. Thus the correct answer is option B.

Soil fertility is reduced by

biology properties of natural resources properties of soil soil pollution and its effects soil and soil pollution

  1. Crop rotation

  2. Nitrogen fixing bacteria

  3. Decaying organic matter

  4. Intensive agriculture

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Correct Option: D

Water logging of soil makes it physiologically dry because

biology properties of natural resources properties of soil soil pollution and its effects soil and soil pollution

  1. This condition does not allow the capillary force to work.

  2. This condition does not allow oxygen to enter the soil.

  3. Both A and B.

  4. None of the above.

Show answer
Correct Option: B
Explanation:

The soil needs to be aerated and watered properly to allow proper growth and development of the plants. When the plants are watered frequently or the water is not drained properly, then the water logging takes place. Due to the accumulation of the water in the soil, the oxygen cannot enter into the soil and in the roots of the plants. This results in the death of the plants. 

Thus, the correct answer is option B. 

Which type of crops put lesser pressure on the soil?

biology properties of natural resources properties of soil soil pollution and its effects soil and soil pollution

  1. Rotation crops

  2. Early maturing crops

  3. Regular crops

  4. All types of crops

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Correct Option: B

Which of the following processes reduces soil fertility?

biology properties of natural resources properties of soil soil pollution and its effects soil and soil pollution

  1. Decaying organic matter

  2. Crop rotation

  3. The addition of $N _2$ fixing bacteria

  4. Intensive agriculture

Show answer
Correct Option: D
Explanation:

Intensive agriculture is the commercial agriculture where chemical pesticides and fertilizers are used to increase the crop production for more earning. By the use of the chemical in large amount soil fertility gets reduced. Thus, the correct answer is option D.