agriculture MCQs – Page 156

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 Review each marked answer and report any item that may be outdated or unclear.

3101. The maximum amount of water which a soil can hold after free drainage has ceased is called as_______?
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A. Water harvesting

B. Water use efficiency

C. Water potencial

D. Water holding capacity
3102. Aridisols cover the largest in Pakistan_______?
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A. 278,910 km<sup>2</sup>

B. 259,710 km2

C. 269,810 km<sup>2</sup>

D. None of these

3103. Wind transported materials if it is silt dominated is__________?
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A. Colluvial

B. Eolian

C. Alluvial

D. Loess
3104. Clay and humus particles are referred to as colloids and are less than 0.002mm. Due to their small size, colloids have ________________ surface area which provides surface for adsorption, catalysis, precipitation and microbial colonization:
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A. Very little

B. None of these

C. Extremely high

D. Extremely low

3105. Combination of soil genesis and classification is collectively called_________?
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A. Pedology

B. Poly pedology

C. Edaphology

D. None of the above

3106. Organic Soils are classified as ____________ and are also known as ____________ soils:
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A. Alfisols. fine & coarse textured

B. Ultisols, Fe & Al rich

C. None of the above

D. Histosols, peat & muck
3107. Which leaf of rice is sampled for tissue nutrient analysis?
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A. Mature leaf

B. Lower leaf

C. Both A & B

D. None of these
3108. Weathering is the natural process of__________?
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A. Disintegration

B. Sedimentation

C. Decomposition

D. both A & C
3109. Conservation agriculture improves the water use efficiency of dryland systems. It has components:
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A. Residue return to keep at least 30% of soil covered

B. all of the above

C. Reduced soil disturbance through no-till or minimum till

D. Crop rotations for better utilization of available water & nutrients

3110. The instrument used for measuring the photosynthetically active radiations (PAR) is:________?
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A. Pyrheliometer

B. Pyrgeometer

C. Quantom sensor

D. Both A & C

3111. Element responsible pollen grain of plant__________?
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A. P

B. N

C. B

D. K

3112. According to one estimate, wind and water erosion over ______ % of the Pakistans total area?
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A. None of the above

B. 76%

C. 46%

D. 36%

3113. The seventieth element included in the list of essential nutrient element is:__________?
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A. Cobalt

B. Vanadium

C. Nickle

D. Sodium

3114. The availability of essential nutrients from soil to the plants is controlled by the ________ properties of soil:
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A. Physical

B. chemical

C. Biological

D. both A & B

3115. Organic matter influences:_________?
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A. Cation exchange capacity

B. Aggregate stability

C. All of the above

D. Water holding capacity

3116. The configuration of a surface and the relations among its man-made and natural features is called:________?
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A. All of the above

B. topograpy

C. Topography

D. Tofography

3117. Potassium (K) fixation capacity is maximum in:____________?
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A. Illite

B. Montmorillonitic

C. Vermiculite

D. Amorphous clay

3118. Humus generally refers to the decomposed organic residues which have undergone a series of degradation and synthesis cycles. The humic substances consist of a series of highly acidic, yellow to black coloured, high molecular weight compounds __________________, which can be separated using different extraction procedures:
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A. Hymatomelanic acid & Humin

B. Humic acid & Fulvic acid

C. both A & B

D. None of these

3119. Loss of nitrogen in the form of NH3 in alkaline medium is known as_________?
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A. None of these

B. Leaching

C. Denitrification

D. Volatilization
3120. In cation exchange, 18 mg of Ammonium ion can be exchanged for__________?
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A. 6 mg of Al

B. 12 mg of mg

C. 46 mg of Na

D. 40 mg of Ca