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NCERT Solutions for Class 7 Science Chapter 9 Soil

NCERT Solutions for class 7 science chapter 9 soil: Solved Exercise Questions:

Tick the most suitable answer in question

Q1. In addition to the rock particles, the soil contains
(i) air and water
(ii) water and plants
(iii) minerals, organic matter, air and water
(iv) water, air and plants

Answer:

In addition to the rock particles, the soil contains (iii) minerals, organic matter, air and water.

The uppermost layer of soil is rich in humus and minerals. The humus makes the soil fertile and provides nutrients to growing plants.

Tick the most suitable answer in question 2.

Q2. The water holding capacity is the highest in
(i) sandy soil
(ii) clayey soil
(iii) loamy soil
(iv) mixture of sand and loam

Answer:

(ii) Clayey soil

The particles in clayey soil are very fine and are packed together tightly. This provides high water retention capacity. Thus, clayey soil has the highest water holding capacity.

Q3. Match the items in Column I with those in Column II :

Column I Column II
(i) A home for living organisms (a) Large particles
(ii) Upper layer of the soil (b) All kinds of soil
(iii) Sandy soil (c) Dark in colour
(iv) Middle layer of the soil (d) Small particles and packed tight
(v) Clayey soil (e) Lesser amount of humus

Answer:

Column I

Column II

A home for living organisms

(b) All kinds of soil

Upper layer of the soil

(c) Dark in colour

Sandy soil

(a) Large particles

Middle layer of the soil

(e) Lesser amount of humus

Clayey soil

(d) Small particles and packed tight

Q4. Explain how soil is formed.

Answer:

The breaking down of rocks by the action of wind, water and climate is known as weathering. Soil is formed by the process of weathering.

The type of rock decides the nature of soil formed and the type of vegetation that grows in it.

Q5. How is clayey soil useful for crops?

Answer:

Clayey soil is very useful for crops for the following reasons:

(i) It has the highest water retaining capacity.

(ii) It is very fertile because of humus present in it.

This makes it suitable for growing cereals like wheat, gram and paddy.

Q6. List the differences between clayey soil and sandy soil.

Answer:

Differences between clayey soil and sandy soil are:

Clayey soil

Sandy soil

Contains finer particles

Contains larger particles

Particles are tightly packed

Particles are loosely packed

It is fertile

It is not fertile

High water retention capacity

Low water retention capacity

Lowest percolation rate of water

Highest percolation rate of water

Q7. Sketch the cross section of soil and label the various layers.

Answer:

The various layers of soil are:

sohil

A- horizon or topsoil : Soft, porous and can retain more water.

B- horizon or middle layer: Harder and more compact.

C- horizon or third layer: Made up of small lumps of rocks with cracks and crevices.

Bedrock: Hard and difficult to dig.

Q8. Razia conducted an experiment in the field related to the rate of percolation. She observed that it took 40 min for 200 mL of water to percolate through the soil sample. Calculate the rate of percolation.

Answer:

Given,

Time taken to percolate = 40\ min

Amount of water = 200\ mL

We know,

Rate of percolation (mL/min) = \frac{amount\ of\ water}{percolation\ time}

= \frac{200\ ml}{40\ min}

= 5\ mL/min

Therefore, percolation rate of water = 5\ mL/min

Q9. Explain how soil pollution and soil erosion could be prevented.

Answer:

The ways to prevent soil pollution are:

(i) Recycling of non-biodegradable wastes.

(ii) Limiting the use of pesticides and insecticides.

(iii) Making dumping grounds of non-biodegradable wastes far away from fertile land.

The removal of land surface by water, wind or ice is known as erosion. The ways to prevent soil erosion are:

(i) Afforestation or planting of trees.

(ii) Reduce cutting down of trees or deforestation.

(iii) Using step farming in hilly regions

Q10. Solve the following crossword puzzle with the clues given:

Across
2. Plantation prevents it.
5. Use should be banned to avoid soil pollution.
6. Type of soil used for making pottery.
7. Living organism in the soil.

Down
1. In desert soil erosion occurs through.
3. Clay and loam are suitable for cereals like.
4. This type of soil can hold very little water.
5. Collective name for layers of soil.

Answer:

Across:

2. EROSION

5. POLYTHENE

6. CLAY

7. EARTHWORM

Down:

1. WIND

3. WHEAT

4. SANDY

5. PROFILE

Chapter No. Chapter Name
Chapter 1 NCERT solutions for class 6 Science Chapter 1 Food: Where Does It Come From?
Chapter 2 NCERT solutions for class 6 Science Chapter 2 Components of Food
Chapter 3 NCERT Solutions for class 6 science chapter 3 Fibre to Fabric
Chapter 4 NCERT Solutions for class 6 science chapter 4 Sorting Materials into Groups
Chapter 5 NCERT Solution for class 6 science chapter 5 Separation of Substances
Chapter 6 NCERT solutions for class 6 science chapter 6 Changes around Us
Chapter 7 NCERT solutions for class 6 science chapter 7 Getting to Know Plants
Chapter 8 NCERT Solutions for class 6 science chapter 8 Body Movements
Chapter 9 NCERT solutions for class 6 science chapter 9 The Living Organisms Characteristics and Habitats
Chapter 10 NCERT Solution for class 6 science chapter 10 Motion and Measurement of Distances
Chapter 11 NCERT solution for class 6 science chapter 11 Light, Shadows, and Reflections
Chapter 12 NCERT solutions for class 6 science chapter 12 Electricity and Circuits
Chapter 13 NCERT solutions for class 6 science chapter 13 Fun with Magnets
Chapter 14 NCERT Solution for class 6 science chapter 14 Water
Chapter 15 NCERT solutions for class 6 Science Chapter 15 Air Around Us
Chapter 16 NCERT Solutions for Class 6 Science Chapter 16 Garbage In, Garbage Out

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Class 7 Science Chapter 9 Soil
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