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soil science MCQs

Practise focused soil science questions with marked answers for exam preparation and subject revision.

soil science Mcqs
1. Nutritive elements needed in large quantities to ensure normal plant development:
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A. N, P, K

B. S, Mg, Ca, Fe

C. Both a & b

D. None of a & b

2. Which is the main cause of desertification?
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A. None of the above

B. Accelerated activities

C. Over grazing

D. Dry farming agriculture

3. Soils are also contaminated by a number of inorganic compounds which are also high toxic to human & other animals & are extremely poisonous may include:
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A. Arsenic & Cadmium

B. Mercury & chromium

C. Calcium & Magnesium

D. Both A & B
4. Which of the following nutrient play the most effective role in controlling rate of transpiration:
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A. Zinc

B. Phosphorus

C. Potassium

D. Mg

5. Any material such as straw, sawdust, leaves, plastic films, & loose soil that is spread upon the surface of the soil to protect the soil & plant roots from the effects of raindrops, soil crusting, freezing or evaporation:
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A. Mulch

B. Muck

C. Mycorrhizae

D. Mull

6. The lower leaves turn yellow and in some crops they quickly start drying up as if suffering from shortage of water, stunted growth, leaves & fruits shedding & whole plant becomes yellow, are deficiency symptoms of:_________?
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A. Potash

B. Nitrogen

C. Calcium

D. Both a & c

7. The highest Cation Exchange Capacity is in:_________?
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A. Sandy Soil

B. Clay soil

C. Gravely soil

D. Both A & C

8. The solid wastes generated in Pakistan are about: ___________?
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A. 65, 772 tonnes/day

B. All of the above

C. 12250 tonnes/day

D. 47,920 tonnes/day
9. Field Capacity is a point at which?
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A. All the macro & micropores in the soil are filled with water

B. All the macropores filled with air & the micropores filled with water

C. All of the above wrong

D. All the macropores filled with water & the micropores filled with air

10. An important component of total soil C is charcoal, also known as:__________?
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A. Black C

B. Biochar

C. Both A & B

D. None of the above

11. What civil engineers called soil?
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A. Land

B. Soil

C. Earth

D. ragmented rock

12. Term forest is derived from: ___________?
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A. None of the above

B. Latin word

C. French word

D. English word

13. Flow of nitrogen in soil due to:_________?
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A. None of the above

B. Diffusion

C. Interception

D. Mass flow
14. Chemicals, used for controlling the disease of crops, fruits & vegetables is___________ & chemical prepared for controlling insect-pests -:
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A. Weedicidesinsecticides

B. None of the above

C. InsecticidesHerbicides

D. FungicidesInsecticides
15. Maximum fixation of K occurs:__________?
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A. 1:2 clay mineral

B. 1:1 clay mineral

C. 2:2 clay mineral

D. 2:1 clay mineral
16. Fossils are found in which type of rock:
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A. Sedimentary rock

B. Metamorphic rock

C. Stratified rock

D. Both A & C
17. Which type of structure is dominant in grasslands:
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A. Spheroidal or Sphere-like

B. Prismatic & Columnar

C. Platy & Luminar

D. Angular blocky Sub-angular blocky

18. Extrusive rocks are also called as ___________ in which the grain or crystalline structure is too fine to be seen by the unaided eye?
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A. Volcanic Rock

B. Igneous Rock

C. Aphantic Rock

D. Both A & B

19. Items needed for synthesis of plant food in green leaves are _________ & the process through which it takes place is called photosynthesis:
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A. Sunlight

B. All of the above

C. Chlorophyll

D. Water & plant nutrients

20. Plants which grow on sandy soils:_________?
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A. Psammophytes

B. None of these

C. Lithophytes

D. Chasmophytes