Worksheets With Solutions: Soil Class 3 Worksheet Science

Section A: Multiple Choice Questions

Correct Answer is Option (a)

Soil is formed from the breakdown of rocks, organic matter, water, air, and living organisms.

Q.2. Which of the following is NOT a factor affecting soil formation?
(a) Climate
(b) Time
(c) Plants
(d) Gravity

Correct Answer is Option (d)
The factors affecting soil formation are climate, time, parent material, topography, and living organisms.

Q.3. The uppermost layer of the soil is known as:
(a) Bedrock
(b) Subsoil
(c) Topsoil
(d) Parent material

Correct Answer is Option (c)
The uppermost layer of soil, which contains the most organic matter and microorganisms, is called topsoil.

Q.4. Sandy soil is:
(a) Heavy
(b) Rich in nutrients
(c) Water-retaining
(d) Poor in nutrients

Correct Answer is Option (d)

Sandy soil is coarse and allows for good drainage, but it is not able to retain moisture and is poor in nutrients.

Q.5. Which type of soil is best suited for growing crops?
(a) Sandy soil
(b) Clay soil
(c) Loamy soil
(d) Rocky soil

Correct Answer is Option (c)
Loamy soil is a mixture of sand, silt, and clay, making it the best type of soil for growing crops.

Section B: Short Questions

Soil is formed from the breakdown of rocks, organic matter, water, air, and living organisms. Over time, these materials are weathered and mixed together to create soil.

Q.2. Name three factors that affect soil formation.

The factors that affect soil formation are climate, time, parent material, topography, and living organisms. Climate influences soil formation through temperature and precipitation, while time allows for the accumulation of organic matter. Parent material determines the type of soil that will form, while topography affects the movement of water and the accumulation of soil. Living organisms contribute to the breakdown of organic matter and the formation of nutrients.

Q.3. What is soil profile?

Soil profile is the vertical sequence of layers that make up the soil. These layers are called horizons and are defined by their physical and chemical properties.

Q.4. What are the different layers of soil?

The different layers of soil from top to bottom are the O horizon, A horizon, E horizon, B horizon, C horizon, and R horizon. The O horizon is the layer of organic matter, while the A horizon is the layer of topsoil. The E horizon is the layer of leaching, while the B horizon is the layer of accumulation. The C horizon is the layer of weathered parent material, while the R horizon is the layer of unweathered bedrock.

Q.5. What are the properties of soil? 

The properties of soil include texture, structure, porosity, permeability, and fertility. Texture refers to the size of soil particles, while structure refers to the way particles are arranged. Porosity refers to the amount of space between particles, while permeability refers to the ability of water to move through the soil. Fertility refers to the presence of nutrients and organic matter.

Section C: Fill in the blanks

Soil is the uppermost layer of the earth's crust.

Soil is the layer of loose material covering the Earth's surface. It varies in depth from a few centimeters to several meters.

Q.2. The process of breaking down rock into smaller particles is called ____________.

The process of breaking down rock into smaller particles is called weathering.

Weathering is the process of breaking down rocks, soils, and minerals through contact with the Earth's atmosphere, water, and biological organisms.

Q.3. The three factors affecting soil formation are ___________, ___________, and ____________.

The three factors affecting soil formation are climate, parent material, and time.

Climate affects soil formation by determining the amount and type of precipitation, temperature, and wind. Parent material is the rock or sediment from which soil is formed. Time refers to the length of time that the soil has been developing.

Q.4. The vertical section of the soil is called the ____________.

The vertical section of the soil is called the soil profile.

The soil profile is the vertical section of the soil, showing the different layers or horizons that make up the soil.

Q.5. The five main components of soil are _________, _________, _________, _________, and ___________.

The five main components of soil are minerals, organic matter, water, air, and living organisms.

Minerals are the inorganic components of soil, such as sand, silt, and clay. Organic matter includes plant and animal residues, as well as microorganisms. Water and air are important for plant growth and soil health. Living organisms, including plants, animals, and microorganisms, contribute to the fertility and structure of soil.

Section D: Match the column

Section E: True or False

False
Soil is made up of a mixture of organic and inorganic materials, such as minerals, water, air, and living organisms.

Q.2. Soil profile consists of only two layers.

False
Soil profile consists of several layers, including the topsoil, subsoil, and bedrock.

Q.3. Soil pollution can lead to health problems in humans. 

True
Soil pollution can contain harmful chemicals and toxins that can contaminate food and water sources, leading to health problems in humans.

Q.4. Soil erosion is caused only by natural processes.

False
Soil erosion can be caused by natural processes such as wind and water, but human activities such as deforestation and overgrazing can also contribute to soil erosion.

Q.5. All types of crops can grow in any type of soil.

False
Different types of crops require different types of soil conditions, such as pH levels and nutrient content. For example, crops like blueberries require acidic soil, while crops like tomatoes prefer slightly alkaline soil.