Chapter 9
Soil
Exercise
Mark the most appropriate answers to questions 1 and 2
1) On top of rock fragments, on the ground
a) Air and water.
b) Water and plants.
c) Mineral salts organic matter, air and water.
D) Water, air and plants.
Answer: (c) Mineral salts organic matter, air and water.
2) Water holding capacity is maximum
a) Sandy soils.
b) Altia soil.
c) Domoja soil.
d) Soils containing sand and organic matter.
Answer: (b) Altia soil.
3) Level 1 is close to level 2
Level-1 Level-2
A) Habitat of organisms is a) Dung granules
b) Surface soil b) All types of soil
c) sandy soil c) leaf color
d) Soil medium d) Fine particles and tight bands
e) Loamy soil e) Low amount of humus
Ans: (a) Habitat for life (b) All types of soil.
(b) Soil surface (c) Leaf colour.
(c) sandy soil (a) sand grains.
(d) Tarp in the soil (e) Low amount of humus.
(e) Loamy soil (d) Fine granular and tight bands .
4) What is the structure of soil described and written?
Ans:- As a result of the action of wind, water and climate, landslides are produced. This process is called erosion. It depends on the nature of the soil, the type of rock to be produced and the type of vegetation. A vertical cross-section of the soil through various soil layers is taken as a cross-sectional view of the soil. Generally four layers can be seen in the soil.
5) Why is Altia soil suitable for crops?
Ans:- Clay soils with relatively higher proportion of fine particles are called clayey soils. Altia can hold water in small empty spaces between soil granules. Therefore, there is less air in the soil. Altia soil is suitable for crops because it can hold more water.
6) Now list the major differences between Altia mati and Balichhia mati.
Ans:- The main difference between Altia mati and Balichhia mati is---
1) Altia soil granules are finely divided into sandy soil granules.
2) The amount of air in clay soil is less, whereas in sandy soil, the amount of air in the open space is higher.
3) Altia soil can hold more water but sandalwood soil can hold water easily.
7) To identify soil profile and different layers.
Answer: - Draw the side-picture yourself and identify the different levels.
8) Rajiya tested it on the secretion of water. So it was observed that it took 40 minutes for 200 ml of water to absorb into the soil samples. Determine the water absorption rate.
Answer: - 200 ml. It took 40 minutes for the water to be absorbed.
9) Explain how soil pollution and soil erosion can be prevented.
Answer:- I can follow different ways to prevent soil pollution. Plastic is the main cause of soil pollution. The rapid use of polythene and plastic has polluted the soil to a great extent. It takes thousands of years for a milliliter of plastic to turn into soil. Therefore, plastic, polythene, solar paper material should be used. It destroys the living things in the soil. Soil pollutants are various types of chemicals and wastes. These bores destroy the quality of the soil. In agriculture, pesticides and chemicals are used in greenhouses, composting manure or cow dung. Therefore, I have to make arrangements for renewing any object or material.
If soil erosion is prevented, I will plant trees. Today, by destroying the forest areas, various types of industries have been intensified by the people. As a result, the number of trees is decreasing and soil erosion is increasing. By preventing soil erosion, it will take good care of the people and the friends of the rivers. As a result of the destruction of the river, many people have lost thousands of acres of land.
10) Solve the word series below with the help of the given numbers?
Thiyakoi:
1) Coarse and fine particles are almost equal types of soil.
3) It is a characteristic of the upper layers of the soil.
5) Domaja soil, sand, other materials that remain outside the soil.
Pathalika:
2) Soiled rotten material.
4) Low humus and high mineral content of soil.
6) A mixture of humus and particles is used as soil.
