Soil Worksheet-2

Soil Worksheet-2

Multiple-Choice Question:

11. Physical disintegration of rocks into smaller pieces is called:

(A) pedogenesis 

(B) chemical weathering                

(C) mechanical weathering

12. The decomposition of rock on exposure to water and atmospheric gases is known as:

(A) pedogenesis 

(B) chemical weathering                

(C) mechanical weathering           

13. Where do sediments come from?

(A)sediments get accumulated as dust gets mixed with other particles

(B) rock weathering produces sediment

(C) there have always been sediments on Earth

14. Clay is a product of:

(A) mechanical weathering            (B) Oxidation of organic wastes

(C) rapid cooling of magma            (D) chemical weathering

15. Oxidation occurs when:

(A) rocks are exposed to the atmosphere       

(B) rocks are deeply buried

(C) feldspars are chemically altered to clays

(D) water dissolves rocks

16. The most common end product of the chemical weathering of quartz is:

(A) pyroxene                

(B) clay               

(C) quartz does not weather chemically

(D) calcite

17. Soil with approximately equal proportions of sand, silt, and clay along with definite amount of organic matter is called:

(A) humus           (B) loam               (C) caliche          

18. Which of the following is the characteristic of soil horizons?

(A) They are classified by assigned letters               

(B) boundaries between soil horizons are usually transitional rather than sharp

(C) they can be distinguished from one another by appearance and chemical composition

(D) all of these

19. The soil horizon rich in organic matter is the:

(A) B horizon                                    (B) O horizon               

(C) A horizon                                    (D) C horizon

20. Tropical soils are typically:

(A) very fertile                                 (B) deeply leached                

(C) good for agriculture                 (D) rich in organic material

Answer Key:

11. (C)
12. (B)
13. (B)
14. (D)
15. (A)
16. (C)
17. (B)
18. (D)
19. (B)
20. (B)