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Soil

Description: Soil, Chemistry, Science
Number of Questions: 15
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Tags: Science Soil VII Chemistry Soil Profile, Soil Types, Properties of Soil Soil and Crops Photosynthesis Saprophytic Nutrition Nutrition and its Modes in Plants Plant Nutrition
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Which of the following options correctly defines weathering?

  1. The different layers of soil

  2. The less porous layer of soil

  3. The rotting dead matter in soil

  4. The breaking down of rocks

  5. The mixture of rock particles and humus

Show answer
Correct Option: D
Explanation:

Soil is formed when rocks are broken down by the action of wind, water and climate. This process is called weathering.

Which of the following is not a layer of soil?

  1. Topsoil

  2. Humus

  3. Middle layer

  4. Horizon C

  5. Bedrock

Show answer
Correct Option: B
Explanation:

It is correct. The topmost layer is dark in colour, and contains the remains of dead plants and animals. This rotting matter is called humus. Humus is thus, a part of topsoil, not a separate layer.

Which of the following characteristic belongs to the horizon B layer?

  1. It is dark in colour and contains the remains of dead plants and animals.

  2. Many tiny organisms, such as beetles, worms and rodents, live in it.

  3. It has cracks running through it.

  4. It contains more minerals but less quantity of humus and is less porous.

  5. It is difficult to dig up this layer even with a spade.

Show answer
Correct Option: D
Explanation:

It is correct. The layer below the topsoil is called B-horizon or the middle layer. This is the middle layer or the horizon B characteristic feature.

The rate of absorption is different for different types of soil. This phenomenon of absorption of water by soil is termed as

  1. horizon

  2. weathering

  3. soil profiling

  4. percolation

  5. erosion

Show answer
Correct Option: D
Explanation:

The phenomenon of absorption of water by soil is termed percolation.

A vertical section that shows different layers of soil is called a

  1. soil profile

  2. horizon

  3. decomposition section

  4. characteristic of the soil

  5. None of these

Show answer
Correct Option: A
Explanation:

Yes, a vertical section that shows different layers of soil is called a soil profile. Each layer is called a horizon.

Match the two columns: Layers of the soil and their characteristic features

 
a. Top soil i. less porous and harder
b. Middle layer ii. cracks running through
c. Horizon c iii. more solid and very hard
d. Bedrock iv. humus and minerals

  1. a - i, b - ii, c - iii, d - iv

  2. a - iv, b - i, c - ii, d - iii

  3. a - iii, b - ii, c - iv, d - i

  4. a - ii, b - iv, c - iii, d - i

  5. a - ii, b - iii, c - iv, d - i

Show answer
Correct Option: B
Explanation:

Yes, are all correctly matched. Top soil contains humus and minerals. Middle layer is less porus and harder. Horizon C has cracks running through it. Bedrock is more solid and very hard.

Directions: Read the statement carefully and answer the question that follows in light of the statement.Soil forms different layers of particles of different sizes.

Aneesh wants to set up a garden in his home. He wants to know what type of topsoil would be best for growing plants?

  1. Sandy

  2. Humus

  3. Silt

  4. Clayey

  5. Loamy

Show answer
Correct Option: E
Explanation:

The best topsoil for growing plants is loam. Loamy soil is a mixture of sand, clay, humus and silt. It has the right water holding capacity for the growth of plants.

Which of the following is NOT a property of sandy soil?

  1. This soil type lacks water retention capacity.

  2. The sand particles are relatively large and air is filled in these spaces.

  3. They have very less space between particles.

  4. The water absorption is very high as the water passes quickly.

  5. These soils are light, well aerated and dry.

Show answer
Correct Option: C
Explanation:

Yes, it is the correct answer, as it is not the property of sandy soil. There are large spaces between the particles in sandy soil. These places are filled with air. Thus it will be wrong to say that they have less space between them. 

Cereals like wheat and gram can be grown in which type of soil/s?

  1. Clayey

  2. Loamy

  3. Sandy

  4. Sandy and loamy

  5. Clayey and loamy

Show answer
Correct Option: E
Explanation:

Yes, it is correct. Clayey and loamy soils are both suitable for growing cereals like wheat and gram. Such soils are good at retaining water.

Which of the following statements is correct?

  1. The components of the soil alone determine the types of vegetation and crops that grow in a particular area.

  2. Aforestation causes soil erosion.

  3. Soil erosion is slow in areas of little or no surface vegetation.

  4. The amounts of sand and clay in a soil depend on the rock from which the soil particles have been formed.

  5. The rate of absorption of a soil depends on the climactic factors.

Show answer
Correct Option: D
Explanation:

 It is correct. The amounts of sand and clay in a soil depend on the rock from which the soil particles have been formed.

Which of the following is NOT a property of clay soil?

  1. It is made of a relatively high proportion of fine particles.

  2. This soil have very less space between particles and are tightly packed.

  3. The water can be trapped in the tiny gaps between the particles.

  4. This soil is heavy and hold more water.

  5. The water absorption is very high as the water passes quickly through these spaces.

Show answer
Correct Option: E
Explanation:

 This is a characteristic of sandy soil. Clayey soil holds water, not absorbs it.

Directions: Read the statement carefully and answer the question that follows: Riya recently discovered that soil has micro organisms. She wants to know how do they get their food (moisture and nutrients for growth and survival). Her mother tells her that these micro organisms get their food from the soil itself.

Which of the habitats given below has plenty of water and nutrients in the soil to support microorganisms?

  1. The desert

  2. The forests

  3. The schoolplay field

  4. High mountain areas

  5. A construction site

Show answer
Correct Option: B
Explanation:

 The soil in forest reserves is rich in humus and is fertile because it has moisture as well as nutrients.

Directions: Read the following statements carefully

  1. Weathering is a swift process.
  2. Different types of soils are used to cultivate different types of crops.
  3. Various layers of soil are called horizons.Which of the above given statement/s is/are correct?

  1. Only 1

  2. Only 2

  3. Only 3

  4. Both 1 and 2

  5. Both 2 and 3

Show answer
Correct Option: E
Explanation:

Correct. Both the statements are correct. Different types of soils are used to cultivate different types of crops and also various layers of soil are called horizons.

Match the two columns:

 
Soil Properties
(a) Loamy (i) Large particles
(b) Sandy (ii) Fertile
(c) Clay (iii) Water draining

  1. A - iii, B - i, C - ii

  2. A - iii, B - ii, C - i

  3. A - i, B - ii, C - iii

  4. A - i, B - iii, C - ii

  5. A - ii, B - i, C - iii

Show answer
Correct Option: A
Explanation:

It is correct. Loamy soil has  water draining and air logging capacity. Sandy soil has large particles. Clay soils are rich in humus and are fertile.

Directions: Read the statements carefully and answer the question that follows.

  1. Clayey soils consist of smaller, tightly packed sand particles.
  2. Clayey soils are well areated.
  3. Loamy soils are heavy and hold more water.Which of these statements are correct?

  1. Only 1

  2. Only 2

  3. Only 3

  4. Both 1 and 2

  5. Both 2 and 3

Show answer
Correct Option: A
Explanation:

 Correct. Clayey soils consist of smaller, tightly packed sand particles.

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