agriculture MCQs – Page 154

Practise multiple-choice questions from agriculture for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

3061. The resistance of a soil at various moisture contents to mechanical stresses or manipulations:
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A. Soil crusting

B. Soil consistence

C. Bulk Density

D. Both a & c

3062. Which of the following fertilizers show maximum residual acidity with the continuous soil application:
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A. Ammonium sulphate

B. Ammonium nitrate

C. Calcium ammonium nitrate

D. Urea

3063. The credit for identifying the essentality of nitrogen to plants goes to________?
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A. Shafiq Baloch at.el

B. Theodore-saussure

C. Dr.Muhammad Sharif

D. Sach and knoop

3064. Previously Essential nutrients required for the growth of plants were sixteen. In recent time the essential nutrients required for the growth of plants are:_________?
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A. 18

B. 17

C. None of the above

D. 16

3065. Most common rocks, after exposed to weathering which cover about ______% 0f the earth:
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A. Igneous rocks

B. metamorphic rocks

C. Shales

D. Sedimentary rocks
3066. The tree sends down roots from its branches to the soil is know as:_______?
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A. Pine

B. Oak

C. Banyan

D. Palm

3067. Which of the following is not a metamorphic rock?
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A. Marble

B. Granite

C. Sand stone

D. both A & B
3068. Which of the following crops is most tolerant to salty soils?
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A. Carrot

B. Rice

C. Cotton

D. Corn

3069. What is the formula of urea?
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A. None of these

B. NH<sub>2</sub>-CO-NH-CO-NH<sub>2</sub>

C. (NH<sub>4</sub>)<sub>2</sub>CO<sub>3</sub>

D. CO (NH2)2
3070. The mineral component of soil consists of_________?
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A. Air

B. Water

C. both A and B

D. none of the above
3071. Sustainable Technologies to Control Water-Logging:
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A. Planting of eucalyptus in water-logged areas.

B. Installation of tube-wells for irrigation and vertical drainage.

C. All of these

D. Planning and designing of future canals on proper lines.

3072. A mineral horizon that is either too thin, too light in colour, too low in organic matter:
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A. Mollic epipedon

B. Ochric epipedon

C. Umbric epipedon

D. Melanic epipedon

3073. Pedogenic processes bring about changes in the parent materials in the form of _____________________, within the soil body (soil profile)?
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A. Additions, losses

B. Transfers and transformations

C. both A and B

D. None of the above

3074. Association of two microorganisms in which one is benefited while other remains unaffected is known as:________?
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A. Ammensalism

B. This statement is wrong

C. Commensalism

D. Competetion

3075. Source of negative charges on silicate clays is/ are________?
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A. Isomorphous substitution

B. All of these

C. Anion exchange

D. Exposed crystal edges

3076. There are twelve soil orders found in the world of which six soil orders have been recognized at various locations are________?
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A. Andisols, Gelisols, Histosols, Spodosols, Oxisols, Ultisols

B. The above statement is wrong

C. Andisols, Aridisols, Histosols, Vertisols, Regosols, Libosols

D. Entisols, Inceptisols, Aridisols, Alfisols, Mollisols, Vertisols
3077. Following are types if erosion:
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A. All of these

B. Rill & Gully erosion

C. Normal (geological) erosion & Accelerated erosion

D. Rain splash & sheet erosion

3078. According to a latest research, Pakistan is predominantly a dryland country; 80% of its land area is arid and semi arid, 12% sub-humid and 8% under humid climate. Thus , soils of arid & semi-arid regions are vulnerable to a wide range of degradation process. As the case in arid and semi-arid climates elsewhere in south-central/southern Asia and Sub-Saharan Africa; _________________ are among the major causes of soil degradation and desertification?
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A. Accelerated erosion & salinization

B. All of the above

C. Drought stress

D. Depletion of soil fertility and SOM

3079. Which one of the following techniques is used for assessing available P in soil and does not include growing plants:
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A. a-Value

B. A-Value

C. E-Value

D. L-Value

3080. Surface removal of ice or snow from a glacier or snowfield by melting, sublimation, and/ or calving:
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A. Bank-Caving

B. Ablation

C. Abrasion

D. Backplain