Soil Science MCQ For Competitive Exam – 100

1. A well developed soil have

(a) A-horizon

© C-horizon

(b) B-horizon

(d) All of these

2. Reclamation disease due to copper deficiency occurs in plants grown on newly reclaimed

(a) Alfisols

(b) Aridisols

(c) Histosols

(d) All of these

3. Soil formation is

(a) a slow process

(b) a fast process

(c) a slow and continuous process

(d) an indigenous process

4. Which of the following pairs is correctly matched?

(a) Red soil – Calcareous

(b) Alkali soil – pH 9

(C) Black soil – Rich in kaolinite

(d) Laterite soil — pH 8

5. Peat soils are generally

(a) black, heavy and acidic

(b) red light and acidic

(c) black, light and basic

(d) black, heavy and basic

6. A branch of science that deals with the study of origin of the soil, its classification and description is known as

(a) Edaphology

(b) Ecology

(c) Pedology

(d) Geology

7. Muck soil containing organic matter.

(a) 20-50%

(b) 50-100%

(C) 5-10%

(d) 10-15%

8. A soil having pH 6.0 is called

(a) acidic soil

(b) alkaline soil

(c) saline soil

(d) normal soil

9. Solum is made up of

(a) C-horizon 

(b) A-horizon

(c) A horizon

(d) C and D-horizon

10. CaCO3, (lime) is added to reclaim of

(a) alkali soil

(b) acidic soil

(c) saline soil

(d) laterite soil

11. Alkali soil are reclaimed by the addition of

(a) gypsum 

(b) lime

(c) phosphorus

(d) calcium

12. cation exchange capacity is highest of

(a) vermiculite

(b) kaolinite

(c) montmorillonite

(d) chlorite

13. The vertical section of soil, which shows different horizons, is called

(a) soil horizon 

(b) soil profile

(c) soil pedon

(d) None of these

14. Geological erosion is also known as

(a) water erosion 

(b) soil erosion

(c) accelerated erosion

(d) natural erosion

15. What is the content of organic matter in alluvial soil?

(a) 0.86-6.53 

(b) 0.34-0.77

(c) 0.28-1 10

(d) 5.9- 8.7

16. ‘Humus’ is made up of

(a) humic materials only

(b) non humus material only

(c) Both (a) and (b) only

(d) None of these

17. A soil with 20 me/100g CEC and 5 me/100g exchangeable H will have a base saturation of

(a) 25%

(b) 80%

(c) 75%

(d) 133.5%

18. Soils with high pH are generally deficient in

(a) Zn and Mn

(b) Cu and Mo

(c) B and Fe

(d) Ca and Mg

19. Chlorite belongs to the

(a) 2, 2 type

(b) 2:1 type

(c) 1: 1 type

 (d) amorphous type

20. soil layer of maximum leaching is indicated by the symbol of

(a) A1

(b) A2

(c) B1

(d) B2

21. The mineral chlorite has an extra layer of

(a) brucite 

(b) illite

(c) gibbosite

(d) montmorillonite

22. Which one of the following minerals is the main source of boron in soils?

(a) Pyrolusite 

(b) Tourmaline

(c) Hematite

(d) Hemimorphite

23. Symbiotic association of fungal hyphae with plant roots is referred to as

(a) lichen 

(b) mutual infection

(c) mycorrhiza

(d) All of these

24. The capacity of soil to be molded when wet, i.e., to change shape in response to stress and to maintain that shape when the stress is removed is termed

(a) consistence 

(b) cementation

(c) plasticity

(d) stickiness

25. Deforestation has an alarming effect on

(a) weed control

(b) soil erosion

(c) insect pest control

(d) None of these

26. The occurrence of quartz in high amounts makes a rock

(a) acidic 

(b) alkaline

(c) neutral

(d) None of these

27. The concept of pH is suggested by the scientist

(a) Sorenson

(b) Hilgord

(c) Larsen

(d) Dean

28. In soil Taxonomy udolls is a suborder of

(a) emisols

(b) mollisols

(c) alfisols 

(d) None of these

29. Silica-sesquioxide ratio is useful in the evaluation of soil in respect of

(a) nutrient availability

(b) iron and aluminum content

(c) silicon content

(d) None of the above

30. Consider the following statements. Cation exchange of soil colloidal clay is due to

1. Silicon tetrahedral layer
II. Isomorphous substitution
III. Hydration of clays
IV. Broken edges of clay lattices

The correct sequence is

(a) I and II

(b) Il and IV

(C) III and IV

(d) I and II

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