agriculture MCQs – Page 147

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 Review each marked answer and report any item that may be outdated or unclear.

2921. The virus infecting bacteria is called:_________?
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A. Bacteriophage

B. Bacteroid

C. Bacterin

D. All of these

2922. Nitrogen fixation is accomplished by:_________?
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A. Bacteria from atmosphere

B. None of these

C. Plants

D. Fungi

2923. In Pakistan, approximately __________ mha of irrigated land is affected by salinization:
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A. 8.2 mha

B. None of the above

C. 12.6 mha

D. 5.7 mha
2924. What is the pH of calcareous soils?
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A. 6.5-7.5

B. 8.5-9.0

C. 8.0-8.5

D. 7.0-7.5

2925. Which of the following is wrong?
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A. Soil texture influences behavior of soil.

B. The arrangement of soil aggregates is called soil structure.

C. The relative percentage of sand, silt, clay is soil texture.

D. Sandy soils have higher sand percentage with more water holding capacity
2926. The credit for identifying the essentality of K, Ca, Mg and P to planta goes to________?
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A. Dr. Muhammad Sharif et al.

B. C. Sprengel

C. Theodore Saussure

D. Shafiq Khalil et al.

2927. Examples of prismatic structures are found in the _______________ mapped in KPK and the northern part of Punjab.
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A. All of the above

B. Peshawar series

C. wazirabad & pindorian series

D. Gujranwala series

2928. Which is/are dominating salt/s in alkali soil:
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A. NaHCO<sub>3</sub>

B. Na<sub>2</sub>CO<sub>3</sub>

C. MgSO<sub>4</sub>

D. th a & b
2929. Which mulch reduce soil temperature?
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A. Polythene

B. White polythene

C. Black polythene

D. Both B&C

2930. Sustainable technologies to improve soil fertility and physical condition:
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A. Regular use of FYM, Composts, acidic mulches, Green manures and Organic fertilizers to increase OM content of Soil.

B. All of the above

C. Balance use of NPK fertilizers according to the need of crops.

D. Following proper crop rotation (shallow rooted and deep root crops) in the cropping session.

2931. Soil order characterized by excess of weathering with dominant iron and aluminium oxide clays, common in tropics is_________?
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A. Entisols

B. Oxisols

C. Alfisols

D. Mollisols

2932. Some times, AB/EB/BA/BE horizons in soil profile are present which are called__________?
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A. Master horizons

B. Transition horizons

C. All of the above

D. Little horizons

2933. Rate of entry of water in soil is__________?
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A. Leaching

B. Infiltration

C. Seepage

D. Percolation

2934. Silica tetrahedron is__________?
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A. Six sided arrangement

B. Eight sided arrangement

C. Four sided arrangement

D. both A & B

2935. Soil is a mixture of__________?
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A. Air

B. Water

C. All of the above

D. Minerals And organic matter

2936. Which nutrients are immobile in plants?
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A. Ca

B. P

C. B

D. Both A & C
2937. The diagnostic techniques used in evaluating soil nutrient status and determining fertilizer requirements of the crop include:
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A. Plant analysis

B. All of the above

C. Greenhouse pot experimentation & soil testing

D. Nutrient deficiency symptoms & field experimentation

2938. Tunnel erosion is the form of:__________?
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A. Gully Erosion

B. Rainsplash erosion

C. Rill erosion

D. Sheet erosion

2939. Organisms satisfying their carbon requirement as Co2 from atmosphere and energy requirement from oxidation of simple inorganic compound are called as_________?
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A. Chemoautotroph

B. None of these

C. Saprophyte

D. Photoautotroph

2940. If a manure pile is exposed to the rain, what nutrient will be lost the most ?
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A. N

B. Ca

C. S

D. Mg