7th Grade > Chemistry
SOIL MCQs
Total Questions : 114
| Page 2 of 12 pages
:
Name of the soil: 1 Mark
Reasons: 2 Marks
Loamy soil is best for growing plants.
It is so because loamy soil hasall the three particles like sand, clay, and silt in perfect balance with each other. The other features of loamy soil are:
1. They holdmoisture to keep plant roots moist.
2. They drainwell enough to prevent roots from becoming waterlogged.
3. They have a rich content of humus to ensure adequate nutrient supply for the plants.
Answer: Option B. -> 40 mL/min
:
B
The percolation rate (mL/min) is calculated by the formula= Amount of water (mL)percolation time (mins)
Percolation rate = 40010
= 40 mL/min
:
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 A. -> True
:
A
Soil profile is the name given to the vertical section of all the different layers of soil. Soil profile helps usunderstand the composition of different types of soils and the properties of each layer of soil.
:
A
Soil profile is the name given to the vertical section of all the different layers of soil. Soil profile helps usunderstand the composition of different types of soils and the properties of each layer of soil.
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 D. -> i - b; ii - c; iii - a
:
D
Sandy soil is characterized by large-sized particles, loosely packed togetherwhich flow easily.
Clayey soil is composed of fine particles which havevery few air gaps and theparticles are tightly packed together.
Loamy soil is a mixture of sandy and clayey soil, along with somepercentage of silt.
:
D
Sandy soil is characterized by large-sized particles, loosely packed togetherwhich flow easily.
Clayey soil is composed of fine particles which havevery few air gaps and theparticles are tightly packed together.
Loamy soil is a mixture of sandy and clayey soil, along with somepercentage of silt.
Answer: Option B. -> They reduce the fertility of the soil.
:
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 thesoil to becomedeficient in nutrients. This results in the reduction in the fertility of the soil.
:
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 thesoil to becomedeficient in nutrients. This results in the reduction in the fertility of the soil.
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 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.
Latest Videos
Latest Test Papers
Login With Google
Old way of Login
Login With Email