The water holding capacity is the highest in

1

(a)

sandy soil

(b)

clayey soil

(c)

loamy soil

(d)

mixture of sand and loam

The soil that can be moulded into any shape is

1

(a)

silt

(b)

sandy

(c)

loamy

(d)

clayey

Soil conservation measures are mainly aimed at protecting which of the following?

1

(a)

Plants

(b)

Topsoil

(c)

Subsoil

(d)

Soil organisms

Percolation rate is measured in unit

1

(a)

mL/min

(b)

min/mL

(c)

lit/min

(d)

mL/sec

Weathering is a very............. process

1

(a)

Slow

Clay is a the..........rock particle.

1

(a)

Smallest

Loam soil is a mixture of,............... and................. with small amount................... of in it.

1

(a)

Sand, silt, humus

Paddy requires.............soil to grow.

1

(a)

clayey

Silt is somewhat bigger rock particles than clay.

1

(a) False

(b) True

Topsoil contains humus.

1

(a) False

(b) True

A-horizon is also known as subsoil.

1

(a) True

(b) False

Does the extent to which a soil can be shaped indicate its type?

1

(a)

Yes

Can you suggest which type of soil would be the best for making pots, toys and statues?

1

(a)

Clayey soil

Boojho wondered why there was a difference in the absorption of water in the two squares

1

(a)

Because different soil are used to make the two squares.

Which soil would have the highest percolation rate?

1

(a)

Sandy soil

Name two soil types used for cultivation.

2

(a)

Explain the term humus that is generally found in the uppermost layer of soil.

2

(a)

The percolation rate varies from soil to other soil. Which soil would have the highest and least percolation rate?

2

(a)

Do all types of soil absorb water to the same extent? Give reason for your answer.

2

(a)

For planting rice, which kind of soil would be most suitable?

2

(a)

Suppose certain sample takes 120 min for 960 mL water to percolate into the soil. Calculate the rate of percolation of water.

3

(a)

A student visits two types of field and observes that soil from field A has high percolation rate of water, while soil from field 8has low percolation rate. In field 8, paddy crop was grown while in field A, there was no standing crop. Name two types of soil present in two fields.

3

(a)

A man digging a pit found that he could dig with ease initially but digging became difficult as he went deeper. He could not big beyond a depth 5 feet. Provide a suitable scientific explanations

3

(a)

Is it a good practice to remove grass and small plants that are growing in an open, unused field? Give reason to support your answer.

3

(a)

During the summer vacations, Gaurav visited his native village. He observed that farmers were using pesticides in their field. He contacted the village head and explained him the effects of such substances in causing soil pollution. Next day, the. village head called a meeting of all the villagers and convinced the villagers not to use chemicals and pesticides.
(a) Why is there a ban to demand the polythene bags and plastics.
(b) List some substances which pollute the soil.
(c) What are the values shown by Gaurav?

3

(a)

Soil erosion does not occur easily where the land is covered by vegetation. Do you agree? Explain.

5

(a)

The raw and baked soil differs from each other. How they are different? How can you prepare matkas from soil?

5

(a)