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Important Questions Test: Soil


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20 Questions MCQ Test General Science(Prelims) by IRS Divey Sethi | Important Questions Test: Soil

Important Questions Test: Soil for Class 7 2022 is part of General Science(Prelims) by IRS Divey Sethi preparation. The Important Questions Test: Soil questions and answers have been prepared according to the Class 7 exam syllabus.The Important Questions Test: Soil MCQs are made for Class 7 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Important Questions Test: Soil below.
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Important Questions Test: Soil - Question 1

A well-developed soil profile is the result of:

Detailed Solution for Important Questions Test: Soil - Question 1

A soil's physical and chemical properties affect plant growth and soil management. Some important physical and chemical properties of soil are mineral content, texture, cation exchange capacity, bulk density, structure, porosity, organic matter content, carbon-to-ni- trogen ratio, color, depth, fertility, and pH.

Important Questions Test: Soil - Question 2

Of the four distinct layers or sections of soil profile, organic matter is found in:

Detailed Solution for Important Questions Test: Soil - Question 2

Top soil contains organic matter. It is rich in humus which is rotting dead matter.

Important Questions Test: Soil - Question 3

Soils are classified according to their:

Detailed Solution for Important Questions Test: Soil - Question 3

Soils are classified on the basis of colour & texture.

Important Questions Test: Soil - Question 4

________ does not lead to soil erosion.

Detailed Solution for Important Questions Test: Soil - Question 4

Dense vegetation helps in protecting the soil from erosion by water and wind.

Important Questions Test: Soil - Question 5

Soil contains rock particle and_______.

Detailed Solution for Important Questions Test: Soil - Question 5

minerals, organic matter, air and water

Important Questions Test: Soil - Question 6

________ has the highest water holding capacity.

Detailed Solution for Important Questions Test: Soil - Question 6

Clayey soil has highest water holding capacity as it is poorly aerated.

Important Questions Test: Soil - Question 7

Various layers of soil are called:

Detailed Solution for Important Questions Test: Soil - Question 7

Layers of soil are called horizons.

Important Questions Test: Soil - Question 8

Humus refers to the:

Detailed Solution for Important Questions Test: Soil - Question 8

Humus is dark, organic material that forms in soil when plant and animal matter decays.

Important Questions Test: Soil - Question 9

Weathering is breaking down of rock by the action of:

Detailed Solution for Important Questions Test: Soil - Question 9

Weathering is the breaking down of rocks, soil, and minerals as well as wood and artificial materials through contact with the Earth's atmosphere, water, and biological organisms.

Important Questions Test: Soil - Question 10

Horizons differ from each other in:

Detailed Solution for Important Questions Test: Soil - Question 10

Soil horizons differ from one another in composition (e.g. clay or organic matter content), physical properties (e.g. color or particle size), or chemical properties such as pH or CEC.

Important Questions Test: Soil - Question 11

______ one be able to see the soil profile.

Detailed Solution for Important Questions Test: Soil - Question 11

The region in which the tree has been uprooted or dug out shows the soil profile. We can see soil profile while digging a well, making deep cut out through soil and while laying foundation for building. 

Important Questions Test: Soil - Question 12

___________ we can see the soil profile.

Detailed Solution for Important Questions Test: Soil - Question 12

The region in which the tree has been uprooted or dug out shows the soil profile.We can see soil profile at the sides of roads on a hill or at a steep of river bank.

Important Questions Test: Soil - Question 13

The upper most horizon of soil is:

Detailed Solution for Important Questions Test: Soil - Question 13

The top most layer is also called the humus layer, which is rich in organic material. This layer consists of decomposed material and organic matter. This is the reason, the topsoil has a dark brown color. 

Important Questions Test: Soil - Question 14

The topmost soil:

Detailed Solution for Important Questions Test: Soil - Question 14

The top most soil has highest concentration of organic matter as a result it can retain more water, is soft and is porous layer.

Important Questions Test: Soil - Question 15

Humus:

Detailed Solution for Important Questions Test: Soil - Question 15

Humus makes the soil fertile and provides nutrients to growing plants.

Important Questions Test: Soil - Question 16

___________ is present, in B-layer, in larger, quantities.

Detailed Solution for Important Questions Test: Soil - Question 16

B-layer contains more minerals and lesser amount of humus.

Important Questions Test: Soil - Question 17

Which soil is well aerated, light and dry?

Detailed Solution for Important Questions Test: Soil - Question 17

Sandy Soil is light, warm, dry and tend to be acidic and low in nutrients. Sandy soils are often known as light soils due to their high proportion of sand and little clay.

Important Questions Test: Soil - Question 18

Which top soil is best for growing plants?

Detailed Solution for Important Questions Test: Soil - Question 18

Loamy soil is best for growing plants. 

Important Questions Test: Soil - Question 19

Which soil is used to make pots and toys?

Detailed Solution for Important Questions Test: Soil - Question 19

Clayey soil is used to make pots and toys.

Important Questions Test: Soil - Question 20

Which soil is used to grow cotton?

Detailed Solution for Important Questions Test: Soil - Question 20

The soil most suitable for cotton is Sandy loamy soil. And thus, black soil is considered best for growing cotton. The farmers sows’ seeds of cotton in the month of March till early june.

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