7th Grade > Chemistry
SOIL MCQs
Total Questions : 114
| Page 10 of 12 pages
Answer: Option A. ->
True
:
A
The climatic conditions like wind, rainfall, humidity, amount of sunlight available etc., determines the type of soil in a particular region. These factors affect the soil profile and bring changes to the soil structure. Hence, we have variety of crops and vegetation in different regions.
:
A
The climatic conditions like wind, rainfall, humidity, amount of sunlight available etc., determines the type of soil in a particular region. These factors affect the soil profile and bring changes to the soil structure. Hence, we have variety of crops and vegetation in different regions.
Answer: Option B. ->
They reduce the fertility of the soil.
:
B
:
B
Plastic bags, fertilizers and other chemical pesticides change the delicate balance of soil, which is crucial for the survival of all dependent organisms. This causes the soil to become deficient in nutrients. This results in the reduction in the fertility of the soil.
Answer: Option A. ->
True
:
A
:
A
Soil profile is the name given to the vertical section of all the different layers of soil. Soil profile helps us understand the composition of different types of soils and the properties of each layer of soil.
Answer: Option A. ->
True
:
A
The removal of fertile toplayer of the soil by wind or water is called soil erosion.
Deforestation is the process of cutting down forests for human activities. This results in soil erosion. When cattle over graze, topsoil gets exposed to natural forces which leads to soil erosion.
:
A
The removal of fertile toplayer of the soil by wind or water is called soil erosion.
Deforestation is the process of cutting down forests for human activities. This results in soil erosion. When cattle over graze, topsoil gets exposed to natural forces which leads to soil erosion.
Answer: Option B. ->
40 mL/min
:
B
:
B
The percolation rate (mL/min) is calculated by the formula = Amount of water (mL)percolation time (mins)
Percolation rate = 40010
= 40 mL/min
Answer: Option C. ->
It can hold a large amount of water.
:
C
The cultivation of paddy requires a large amount of water. Clayey soil has a higher capacity of holding water as compared to sandy or loamy soil. The percolation rate of clayey soil is very low which means that very less water seeps through the soil. This makes it most suitable for the cultivation of paddy.
:
C
The cultivation of paddy requires a large amount of water. Clayey soil has a higher capacity of holding water as compared to sandy or loamy soil. The percolation rate of clayey soil is very low which means that very less water seeps through the soil. This makes it most suitable for the cultivation of paddy.
Answer: Option C. ->
Organic matter
:
A, B, and C
:
A, B, and C
Small particles of rocks are formed due to the weathering of larger rocks. These particles when mixed with humus (organic matter), air and water form soil. The organic matter in the soil is home to many organisms. These organisms add many nutrients and minerals to the soil through their microbial action.
So in addition to rock particles, soil also contains minerals, organic matter, air and water.
Answer: Option C. ->
Organic matter
:
:
Following are the soil types in the decreasing order of the size of the particulate matter.
- Clay
- Silt
- Sand
- Gravel
Latest Videos
Latest Test Papers
Login With Google
Old way of Login
Login With Email