Q.1] List the differences between clayey soil and sandy soil.
Q.2] Why is soil an inseparable part of our life?
Q.3] Explain how soil pollution and soil erosion could be prevented.
Q.4] Describe the different layers of soil profile.
Q5. Fill in the blanks.
i. In addition to the rock particles, the soil contains _____, ________,______, ___ and _______.
ii. The water holding capacity is the highest in ________.
iii. In desert soil erosion occurs through __________.
Q6. True/False.
i. Plantation prevents soil erosion.
ii. Sandy soil is used to make pottery.
iii. Use of polythene should be banned to avoid soil pollution.
iv. Soil is important for life on the earth.
Q7. What is humus?
Q8. What is soil?
Q9. Name some soil pollutants.
Q10. Which soil horizon has a lesser amount of humus but more of minerals?
Answers
Answer:
1.The clayey soil has a high proportion of small (fine) particles. The sandy soil has a high proportion of large particles.Clayey soils are good for growing various crops. Sandy soils are not suitable for growing various crops.
2.Soil is the most important natural resource. It supports the growth of plants by holding the roots firmly. (ii) It helps in supplying water and nutrients to plants. ... Soil is thus an inseparable part of our life.
3.Prevention of soil pollution can be done by (i) use of manures instead of synthetic fertilisers. (ii) use of natural pesticides. (iii) avoid dumping of polythene and plastics in soil. ... Prevention of soil erosion can be done by (i) afforestation that is large scale planting in place of cut down forests
4.The main layers of the soil are topsoil, subsoil and the parent rock. Each layer has its own characteristics. These features of the layer of soil play a very important role in determining the use of the soil.
5. a. Minerals, organic matter, air, and water'.
b.clayey soil
c.wind
6. true
false
true
true
7.Humus is a dark-coloured organic matter formed by the decomposition of plant and animal remains present in the soil. It holds the topsoil in place. It absorbs and holds the water useful for growing plants. It provides food for various plants and animals present in the soil.
8. Soil is the thin layer of material covering the earth's surface and is formed from the weathering of rocks. It is made up mainly of mineral particles, organic materials, air, water and living organisms all of which interact slowly yet constantly.
9.Lead.
Arsenic.
Nickel.
Mercury.
Copper.
Zinc.
Polycyclic aromatic hydrocarbons.
10.It is called the topsoil or the A-horizon. The next layer has a lesser amount of humus but more of minerals. This layer is generally harder and more compact and is called the B-horizon or the middle layer.
Explanation:
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Answer:
When the magnesium metal burns it reacts with oxygen found in the air to form Magnesium Oxide. A compound is a material in which atoms of different elements are bonded to one another. Oxygen and magnesium combine in a chemical reaction to form this compound. After it burns, it forms a white powder of the magnesium oxide. Magnesium gives up two electrons to oxygen atoms to form this powdery product. This is an exothermic reaction as well as combination reaction.
2Mg(s)+O
2
(g)→2MgO(s)+energy