Soil Worksheet-8

Soil Worksheet-8

True/False:

1. Under ideal conditions, soft parent rock takes a long time to develop into soil.
2. A typical, good soil is composed of at least 45% humus.
3. Some plants obtain nitrogen from other organisms instead from the soil.
4. Micronutrients are needed in very small amounts since only the growing regions of the plant require them.
5. In order to determine the nutrients required by plants, they are grown in nutrient-deficient soils.
6. If the soil is very gritty and a pale brownish colour, then it is called sandy soil.
7. If the soil makes a shiny smooth coating on our fingers and is greyish-brown in colour, then it is loamy soil.
8. If the soil is crumbly and dark, but not especially gritty or smooth and shiny, then it is clay.
9. Peat is added to acidic soils to make soil more alkaline.
10. Lime (calcium carbonate) is added to alkaline soils to lower the pH.
11. Fertilizers are added to soil which has low mineral content such as nitrate, phosphate, potassium, and magnesium.
12. The rate of removal of fine particles from the surface is the same as the rate of formation of soil.
13. Repeated grazing by animals on the same patch of land without sufficient recovery periods, leads to more yield of grass on a large scale.
14. Improper farming on hills makes it easy for wind and water to erode soil.
15. The continuous weathering of rock forms soil.
16. The main causes of soil erosion include deforestation, floods and heavy rainfall, overgrazing and improper farming techniques.
17. Loamy soil is used to make pots, toys and statues.
18. Soil profile is a section through different layers of the soil and these various layers are called horizons.
19. Bacteria and other micro-organisms break down plant or animal remains to form subsoil.
20. The lack of rainfall leads to the formation of coarse-textured soil in arid regions.

Answer Key:

1. True
2. False
3. True
4. False
5. False
6. True
7. False
8. False
9. False
10. False
11. True
12. True
13. False
14. True
15. True
16. True
17. False
18. True
19. False
20. True