Question 1

What are the various uses of soil?

Accepted Answer

Various uses of soil are:The plants that are grown in soil can be used for food, clothing, recreation, aesthetics, building materials, medicines, etcSoil has vital nutrients for plants.Soil is an important part of the building process.Clay soil is used in making pottery.Soil is used in wastewater treatment plants.

Question 2

Read the following statements with reference to soil.
i) Weathering is a very fast process of soil formation.
ii) Percolation of water is faster in sandy soils.
iii) Loamy soil contains only sand and clay.
iv) Top soil contains the maximum amount of humus.
Choose the correct statements from the above.

Accepted Answer

Statements (ii) and (iv) are correct. Options (i) and (iii) are wrong. (i) Weathering is a slow process of soil formation and (iii) loamy soil consists of sand, clay and silt along with humus.

Question 3

Regular use of which of the following fertilizers increases the acidity of soil ?

Accepted Answer

Regular use of ammonium sulphate increases the acidity of soil.The hydrolysis of ammonium sulphate produces sulphuric acid  which increases the acidity of soil.   $\displaystyle  (NH_4)_2SO_4 \rightarrow 2NH_3 + H_2SO_4$To prevent acidity, slaked lime is added to neutralize the acid.

Question 4

how many chiral carbon atoms are present in fructose?

Accepted Answer

There are 4 chiral carbon atoms i.e C2; C3; C4; C5.Chiral carbon atoms are those having four different groups.

Question 5

Which of the following soil possess highest percolation rate?

Accepted Answer

The process in which water passes down slowly through the soil is called the percolation of water.Though water can percolate through all types of soil, the rate of percolation of water through different soil is different.Sandy soil is quite loose, so the percolation rate of water is highest in sandy soil.Clayey soil is very compact, so the percolation rate of water is lowest in clayey soil.

Question 6

Negative soil pollution is:

Accepted Answer

Negative soil pollution occurs due to the overuse of soil & its erosion hence there will be a decrease in soil productivity. The other causes of negative soil pollution such as developmental activities, overgrazing and soil erosion.

Question 7

Chief source of soil and water pollution is:

Accepted Answer

Thermal power plant, agro industry and mining all are responsible for soil and water pollution. (Due to extraction of chemicals which cause pollution)

Question 8

State True or False.Use of herbicides and pesticides should be reduced to prevent soil pollution.

Accepted Answer

Herbicides and pesticides are used to prevent the plants and crops from insects and rodents. However, they accumulate on soil and can prove to be harmful. Hence, use of herbicides and pesticides should be reduced to prevent soil pollution.

Question 9

........... is used to make pots, toys and statues.

Accepted Answer

Clayey soil is used to make pots, toys and statues because the clayey soil has the highest water holding capacity than loamy, sandy and silt. Thus, the correct option is D.

Question 10

The type of soil suitable for growing paddy is:

Accepted Answer

The best soil for growing paddy is the Clayey soil as they can hold the water due to their very fine particle size.

Weathering

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REVISE WITH CONCEPTS

Formation of Soil - Weathering

Weathering

Soil formation

External Tectonic Forces - Weathering and Erosion Forces

QUICK SUMMARY WITH STORIES

Formation of Soil: Weathering

Chemical Weathering

Biological Weathering

Meaning, Types and Effects of Weathering

Physical Weathering