Table of Contents
Soil is a crucial part of our environment, essential for growing plants and supporting many living organisms. Chapter 9 of the CBSE Class 7 Science curriculum teaches us about soil, its layers, and how it is formed. We also learn about different types of soil and their importance in our daily lives. This chapter explains how soil is made, what it contains, and why it is important to take care of it. The worksheet for this chapter will help students review what they have learned through simple questions and activities, making it easier to understand the role and value of soil in our world.
CBSE Class 7 Science Soil Worksheet: Soil Composition and Layers
Q.1 The top layer of soil horizon is:
a) A-horizon.
b) B-horizon.
c) C-horizon.
d) bedrock.
Ans: a) A-horizon
The A Horizon is the topmost layer of soil. It may be darker in color than deeper layers and contains more organic material.
Q.2 The layer which is difficult to dig with a spade is called:
a) A-horizon.
b) B-horizon.
c) C-horizon.
d) bedrock.
Ans: d) bedrock
The bedrock layer beneath the C-horizon is hard and difficult to dig with a spade.
Q.3 The layer made up of small lumps of rocks is called:
a) A-horizon.
b) B-horizon.
c) C-horizon.
d) bedrock.
Ans: c) C-horizon
The C Horizon consists of small lumps of rocks with cracks and crevices.
Q.4 Subsoil is referred to as:
a) A-horizon.
b) B-horizon.
c) C-horizon.
d) bedrock.
Ans: b) B-horizon
The B Horizon, or subsoil, contains mineral layers with concentrations of clay, minerals like iron or aluminum, and organic material.
Q.5 The uppermost horizon is generally:
a) light in colour.
b) dark in colour.
c) reddish in colour.
d) bluish in colour.
Ans: b) dark in colour
The uppermost horizon is typically dark because it is rich in humus and minerals.
Q.6 The last layer of soil is:
a) gravel.
b) sand.
c) clay.
d) humus.
Ans: a) gravel
Gravel is the bottommost layer of soil, found after sand, while humus is the topmost layer consisting of decaying organic matter.
Q.7 Soil is composed of distinct layers; the second layer consists of:
a) clay.
b) humus.
c) sand.
d) water.
Ans: d) water
The second layer of soil after humus typically contains water.
Q.8 The soil settled at other places is called:
a) residual soil.
b) transported soil.
c) shifting soil.
d) hard soil.
Ans: b) transported soil
Transported soil is moved from its place of origin by gravity, water, wind, or glaciers.
Q.9 The soil remaining at the same place where it formed is called:
a) residual soil.
b) transported soil.
c) shifting soil.
d) hard soil.
Ans: a) residual soil
Residual soil remains at its place of formation after soluble elements have been dissolved.
Also Check: Types of Soil
CBSE Class 7 Science Soil Worksheets: Soil Characteristics and Properties
Q.10 Percolation rate of water is least in:
a) clayey soil.
b) loamy soil.
c) sandy soil.
d) silt.
Ans: a) clayey soil
Clay particles pack tightly together, leaving little space for air, resulting in low percolation rates.
Q.11 Percolation rate of water is highest in:
a) clayey soil.
b) loamy soil.
c) sandy soil.
d) silt.
Ans: c) sandy soil
Sand particles have large spaces between them, allowing water to drain quickly, leading to high percolation rates.
Q.12 The nature of any soil depends on:
a) climate.
b) water.
c) minerals.
d) rocks.
Ans: d) rocks
The characteristics of soil are influenced by the rocks from which it forms and the type of vegetation it supports.
Q.13 Soil is essential for:
a) agriculture.
b) making curd.
c) milk production.
d) making vaccines.
Ans: a) agriculture
Soil is vital for agriculture, which provides food.
Q.14 Soil profile helps classify soil into different:
a) sizes.
b) layers.
c) textures.
d) concentrations.
Ans: b) layers
A soil profile is a vertical section of soil showing different layers, or horizons, from top to bottom.
Q.15 Soil erosion is caused by:
a) afforestation.
b) deforestation.
c) eutrophication.
d) nitrification.
Ans: b) deforestation
Cutting down trees (deforestation) leads to soil erosion because plant roots help hold the soil together.
Q.16 Weathering leads to:
a) formation of soil.
b) removal of soil.
c) filtration of soil.
d) absorption of soil.
Ans: a) formation of soil
Weathering breaks down rocks into smaller particles, forming soil over time.
Q.17 Seepage of water into the soil is calculated as:
a) rate of percolation.
b) rate of absorption.
c) rate of evaporation.
d) rate of condensation.
Ans: a) rate of percolation
The percolation rate measures how quickly water is absorbed by soil.
Q.18 Soil formation accelerates due to:
a) mineralization.
b) lichens.
c) animals.
d) nitrification.
Ans: b) lichens
Lichens produce acids that break down rocks, speeding up soil formation.
Q.19 Soil formation involves the process of:
a) mineralization.
b) nitrification.
c) oxidation.
d) fragmentation.
Ans: c) oxidation
Oxidation is one of the processes that contribute to the breakdown of rocks into soil particles.
Also Check: Soil Class 7 Notes Science Chapter 9
CBSE Class 7 Science Soil Worksheets: Soil and Water
Q.20 The formula to calculate the percentage of water absorbed uses U, which stands for:
a) weight of the soil.
b) initial volume of water.
c) final volume of water.
d) type of soil.
Ans: b) initial volume of water
The formula (U-V)/50 x 100 calculates the percentage of water absorbed, where U is the initial volume of water.
Q.21 The formula to calculate the percentage of water absorbed uses V, which stands for:
a) weight of the soil.
b) type of soil.
c) final volume of water.
d) initial volume of water.
Ans: c) final volume of water
The formula (U-V)/50 x 100 calculates the percentage of water absorbed, where V is the final volume of water.
Q.22 Adding a handful of soil to water in a beaker and letting it stand undisturbed reveals:
a) layers of soil.
b) types of soil.
c) soil profile.
d) types of minerals.
Ans: a) layers of soil
The different soil particles settle in layers in the beaker.
Q.23 The percentage of water absorbed is calculated by the formula:
a) (U+V)/50 x 100.
b) (U-V)/50 x 100.
c) 50/(U-V) x 100.
d) (U+V)/50 x 1000.
Ans: b) (U-V)/50 x 100
This formula calculates the percentage of water absorbed by the soil.
Q.24 Soil provides microorganisms with:
a) shape.
b) size.
c) habitat.
d) solubility.
Ans: c) habitat
Soil is the habitat for many microorganisms, including bacteria, fungi, and protozoa.
Q.25 Starch in soil exists as:
a) rock form.
b) color form.
c) pigment form.
d) energy form.
Ans: d) energy form
Soil contains energy in the form of organic matter like starch.
CBSE Class 7 Science Soil Worksheets: Soil and Plants
Q.26 The part of the plant that helps prevent soil erosion is:
a) leaf.
b) root.
c) flower.
d) wood.
Ans: b) root
Roots help prevent soil erosion by holding the soil together.
Q.27 The type of vegetation depends on:
a) properties of soil.
b) types of nutrients.
c) types of microorganisms.
d) types of manure.
Ans: a) properties of soil
The type of vegetation is influenced by soil properties like water retention capacity.
Q.28 For good soil, the number of earthworms should be:
a) maximized.
b) minimized.
c) constant.
d) fluctuate.
Ans: a) maximized
Earthworms improve soil by aerating it and enriching it with their waste.
Q.29 Roots of plants hold the particles of:
a) soil.
b) water.
c) minerals.
d) rock.
Ans: a) soil
Roots hold soil particles together, preventing erosion.
Q.30 Wheat grows well in:
a) clayey soil.
b) sandy soil.
c) loamy soil.
d) silt.
Ans: c) loamy soil
Loamy soil is well-aerated, retains moisture, and is suitable for growing wheat.
CBSE Class 7 Science Soil Worksheets: Soil and Pollution
Q.31 Plastic bags in soil are considered pollutants because they:
a) provide minerals.
b) provide water.
c) kill microorganisms.
d) provide light.
Ans: c) kill microorganisms
Plastic bags kill soil microorganisms and are not decomposed by decomposers.
Q.32 Chemicals other than fertilizers that pollute soil are:
a) nutrients.
b) manures.
c) chemicals.
d) minerals.
Ans: c) chemicals
Harmful chemicals that are not degraded by microbes cause soil pollution.
Q.33 The use of pesticides should be:
a) maximized.
b) minimized.
c) constant.
d) fluctuate.
Ans: b) minimized
Pesticides should be minimized to avoid killing beneficial soil microorganisms and prevent chemical buildup in the soil.
Q.34 Pesticides:
a) provide minerals to the soil.
b) provide water to the soil.
c) pollute the soil.
d) provide light to the soil.
Ans: c) pollute the soil
Pesticides contain harmful chemicals that pollute the soil and kill useful microorganisms.
Q.35 Disposing of plastic and polythene bags leads to:
a) erosion.
b) weathering.
c) purification.
d) pollution.
Ans: d) pollution
Plastic bags and polythene pollute the soil as they are non-biodegradable and prevent oxygen flow in the soil.
Q.36 Soil pollution results from the overuse of:
a) nutrients.
b) manures.
c) chemicals.
d) minerals.
Ans: c) chemicals
Excessive use of chemicals and fertilizers makes soil acidic and polluted.
CBSE Class 7 Science Soil Worksheets: Miscellaneous
Q.37 Priya drops water on an unpaved road and on the floor. The water on the floor:
a) absorbed.
b) evaporated.
c) flowed down.
d) disappeared.
Ans: c) flowed down
Water on the floor flows down, while on the unpaved road, it is absorbed due to soil pores.
Q.38 On a hot summer day, air above the soil seems to:
a) blown.
b) shimmer.
c) fall.
d) heavy.
Ans: b) shimmer
The air above the soil shimmers on a hot day due to heat and evaporating water vapors.
Q.39 At the earth’s surface, the breakdown of rocks forms:
a) minerals.
b) nutrients.
c) water.
d) soil.
Ans: d) soil
Soil forms from the breakdown of rocks and other materials at the earth’s surface.
Also Check: Soil Pollution
Q.40 Gram (g) and Kilogram (kg) are units of:
a) volume.
b) mass.
c) density.
d) height.
Ans: b) mass
Gram and Kilogram are units of mass, measuring the amount of matter in a body.
Q.41 Masoor is also known as:
a) chickpea.
b) black-eyed bean.
c) lentils.
d) mung beans.
Ans: c) lentils
Masoor refers to lentils, a type of pulse.
Q.42 The more minerals are found in:
a) bedrock.
b) C-horizon.
c) B-horizon.
d) A-horizon.
Ans: c) B-horizon
The B Horizon, or subsoil, contains higher concentrations of minerals.
Q.43 Horse dung is mixed with soil for making matki, surahi, etc., because it:
a) gives colour.
b) helps open up the pores.
c) hardens the soil.
d) changes the size of soil particles.
Ans: b) helps open up the pores
Burnt horse dung opens up the soil pores, aiding water percolation in matkas and surahis.
Q.44 In a boiling tube, heating soil causes the water in the soil to:
a) distill.
b) evaporate.
c) flow down.
d) absorb.
Ans: b) evaporate
Heating soil causes the water to evaporate and condense on the cooler upper walls of the boiling tube.
Q.45 Rivers of north India, which flow from the Himalayas, deposit their materials called:
a) alluvial soil.
b) residual soil.
c) transported soil.
d) shifting soil.
Ans: a) alluvial soil
Rivers from the Himalayas deposit alluvial soil in the plains of north India.
Q.46 Humus affects the fertility of:
a) plants.
b) soil.
c) rock particles.
d) water.
Ans: b) soil
Humus, rich in nutrients and organic matter, enhances soil fertility.
Q.47 Planting more trees may prevent:
a) weathering.
b) afforestation.
c) erosion.
d) percolation.
Ans: c) erosion
Planting trees prevents soil erosion by stabilizing soil with their roots.
Q.48 Disposing of plastic and polythene bags leads to:
a) erosion.
b) weathering.
c) purification.
d) pollution.
Ans: d) pollution
Plastic and polythene bags pollute the soil by preventing oxygen flow and being non-biodegradable.
Q.49 The process of soil formation accelerates by:
a) mineralization.
b) lichens.
c) animals.
d) nitrification.
Ans: b) lichens
Lichens produce acids that break down rocks, speeding up soil formation.
Q.50 The types of vegetation can be determined by:
a) properties of soil.
b) types of nutrients.
c) types of microorganisms.
d) types of manure.
Ans: a) properties of soil
Vegetation types are influenced by soil properties like water retention.
