Verified past paper — 10 questions
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1
Which symptom is most characteristic of nitrogen deficiency in cereal crops?
A. Uniform yellowing (chlorosis) of older leaves
B. Interveinal chlorosis of young leaves
C. Purpling of leaf margins
D. Necrosis at leaf tips
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Nitrogen is mobile in the plant, so deficiency symptoms appear first as uniform chlorosis of older leaves due to translocation to younger tissues.
2
Which irrigation method is generally considered the most water-use efficient for row crops?
A. Furrow irrigation
B. Drip (trickle) irrigation
C. Sprinkler irrigation
D. Flood irrigation
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Drip irrigation delivers water directly to the root zone with minimal losses, making it more water-use efficient than surface or sprinkler methods.
3
Which practice is least consistent with the principles of Integrated Pest Management (IPM)?
A. Use of resistant varieties
B. Biological control using natural enemies
C. Routine calendar-based pesticide applications regardless of pest monitoring
D. Crop rotation and cultural controls
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IPM emphasizes monitoring and threshold-based actions, whereas routine calendar spraying ignores pest levels and undermines IPM principles.
4
What is the primary objective of silviculture in forest management?
A. To increase wildlife habitat exclusively
B. To prevent any human use of the forest
C. To maximize grazing opportunities
D. To regulate establishment, growth and composition of forest stands to meet management objectives
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Silviculture focuses on practices that establish and tend forest stands so they meet defined objectives such as timber, conservation, or multiple uses.
5
Which soil particle size class is the largest?
A. Sand
B. Silt
C. Clay
D. Loam
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Sand particles are coarser and larger than silt and clay; loam is a textural class composed of a mixture of particle sizes.
6
Which of the following crops forms symbiotic nitrogen-fixing nodules with Rhizobium bacteria?
A. Wheat
B. Soybean
C. Maize
D. Barley
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Soybean is a legume that forms root nodules with Rhizobium species to fix atmospheric nitrogen biologically.
7
A major agronomic benefit of crop rotation is that it primarily:
A. Increases uniform pest populations
B. Guarantees higher yields every season
C. Disrupts pest and disease cycles specific to a crop
D. Eliminates the need for fertilizers
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Rotating crops alters host availability and breaks life cycles of pathogens and pests that specialize on a single crop, reducing their buildup.
8
Which practice best describes 'alley cropping' in agroforestry systems?
A. Planting only forestry species for timber production
B. Grazing livestock exclusively under a closed forest canopy
C. Planting a single tree species as a windbreak along field borders
D. Growing annual crops in the alleys between rows of trees or shrubs
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Alley cropping integrates rows of trees or shrubs with annual crops grown in the intervening alleys to combine benefits of both systems.
9
Controlled-atmosphere storage of fruits primarily reduces losses by:
A. Lowering oxygen and raising carbon dioxide to slow respiration and ripening
B. Increasing oxygen levels to speed ethylene breakdown
C. Keeping humidity extremely low to desiccate pathogens
D. Subjecting produce to continuous light to inhibit mold
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Reducing O2 and elevating CO2 in storage slows fruit respiration and metabolic activity, thereby delaying ripening and reducing spoilage.
10
In even-aged forestry systems, 'rotation age' refers to:
A. The age at which the oldest tree in a mixed stand dies naturally
B. The planned time interval between stand regeneration and final harvest
C. The average age of trees after the first thinning
D. The time required for seed trees to produce cones
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Rotation age is the scheduled period from regeneration (establishment) of a stand until its final harvest in even-aged management systems.