Ncert solutions science class 7 Solutions for Chapter 9 soil

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

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

The water holding capacity is the highest in

(i) sandy soil

(ii) clayey soil

(iii) loamy soil

(iv) mixture of sand and loam

Q2) The water holding capacity is the highest in

(i) sandy soil

(ii) clayey soil

(iii) loamy soil

(iv) mixture of sand and loam

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

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

Column I

(i) A home for living organisms

(ii) Upper layer of the soil

(iii) Sandy soil

(iv) Middle layer of the soil packed tight

(v) Clayey soil

Column II

(a) Large particles

(b) All kinds of soil

(c) Dark in colour

(d) Small particles and packed tight

(e) Lesser amount of humus

Explain how soil is formed.

Q4) Explain how soil is formed.

Q5) How is clayey soil useful for crops?

How is clayey soil useful for crops?

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

List the differences between clayey soil and sandy soil

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

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

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.

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.

Explain how soil pollution and soil erosion could be prevented

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

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

ART

Across

2. Plantation prevents it.

3. Use should be banned to avoid soil pollution.

4. Type of soil used for making pottery.

5. Living organism in the soil.

Down

1. In desert soil erosion occurs through.

2. Clay and loam are suitable for cereals like.

3. This type of soil can hold very little water.

4. Collective name for layers of soil.

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.