7th Grade > Chemistry
SOIL MCQs
Total Questions : 114
| Page 6 of 12 pages
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Each part: 1 Mark
With a sloping ground, the chance of soil runoffs including water runoffs is high.
Loamy soil isbest suited for growing lentils. This is because loamy soilhas about 40% sand, 40% silt and 20% clay by weight. Thesoil'stexture, especially its ability to retain nutrients and water are crucial inputs to agriculture.
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Each factor: 0.5 Mark
The nature of soil depends on the following factors:
1.The parent material from which the soilhas disintegrated.
2.The climatic condition that induced the agents of weathering for the soil to form.
3.The relief features of the land, that is, the topography that exists there.
4. The flora, fauna, and microorganisms at play that contributed to the rate of humus formation.
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Soil is formedby the process of weathering. Weathering is a process of physical breakdown and chemical decomposition of rocks and minerals near or at the surface of the earth. This physical and chemical decomposition is primarily done by wind, water, and climate. As a result of these processes, large rock pieces are converted into smaller pieces and eventually to the soil.
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Infiltration: 1 Mark
Leaching: 1 Mark
1. Infiltration- It is the downward movement of water into the soil.
2. Leaching- It refers to the loss of water-soluble plant nutrients from thesoil, due to rain and irrigation.
Answer: Option A. ->
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Soil is formed by the process of weathering. Weathering is a process of physical breakdown and chemical decomposition of rocks and minerals near or at the surface of the earth. This physical and chemical decomposition is primarily done by wind, water, and climate. As a result of these processes, large rock pieces are converted into smaller pieces and eventually to the soil.
Answer: Option A. ->
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Explanation: 1 Mark
Naming: 2 Mark
Each layer of soil differs in feel (texture), colour, depth and chemical composition. These layers are called horizons.
The three horizons of soil are:
1) A-Horizon
2) B-Horizon
3) C-Horizon
Answer: Option A. ->
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Infiltration: 1 Mark
Leaching: 1 Mark
1. Infiltration- It is the downward movement of water into the soil.
2. Leaching- It refers to the loss of water-soluble plant nutrients from the soil, due to rain and irrigation.
:
Infiltration: 1 Mark
Leaching: 1 Mark
1. Infiltration- It is the downward movement of water into the soil.
2. Leaching- It refers to the loss of water-soluble plant nutrients from the soil, due to rain and irrigation.
Answer: Option A. ->
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Names of pollutants: 1 Mark each
The major soil pollutants are
1. Pesticides and insecticides: Excessive use results in rampant leaching of these chemicals into the soil
2. Plastic bags: Don't get decomposed which lowers the soil fertility.
3.Industrial waste: When recklessly dumped, kills useful microorganisms in the soil.
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Names of pollutants: 1 Mark each
The major soil pollutants are
1. Pesticides and insecticides: Excessive use results in rampant leaching of these chemicals into the soil
2. Plastic bags: Don't get decomposed which lowers the soil fertility.
3.Industrial waste: When recklessly dumped, kills useful microorganisms in the soil.
Answer: Option A. ->
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Preventive measures: 1 Mark each
Soil erosion can be prevented by the following methods:
1. Afforestation: Afforestation means planting trees.The roots of the trees hold the soil layer firmly and prevent soil erosion.
2. Improve drainage: Areas with heavy water runoff can use underground perforated drainage pipes which will help prevent soil erosion.
3. Contour farming and terracing: It is the practice of tilling sloped land along lines of consistent elevation in order to conserve rainwater and to reduce soil losses from surface erosion.
![Name The Constituents Of Soil. [2 MARKS]](https://lakshyaeducation.in/quizpics/quiz/content_pie_soil.jpg "Click to Enlarge Image")
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