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Subel. Y3
10 questions
Subelement Y3

YAM HARVESTING AND STORAGE

Section Y3D

Long-term storage methods

What is the traditional yam storage structure used in West Africa?

  • Refrigerated warehouse
  • Underground freezer
  • Correct Answer
    Yam barn with thatched roof and open sides
  • Sealed concrete bunker
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What is the optimal temperature range for long-term yam storage?

  • Correct Answer
    57-61°F (14-16°C)
  • 32-35°F (0-2°C)
  • 80-85°F (27-29°C)
  • 100-110°F (38-43°C)
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Why should yams NOT be stored with fruits like apples and bananas?

  • Risk of cross-species disease
  • Flavor contamination
  • Potential hybridization
  • Correct Answer
    Ethylene produced by fruits accelerates yam sprouting
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What is the typical maximum storage duration for properly cured and stored yams?

  • 1-2 weeks
  • Correct Answer
    4-6 months
  • 2-3 years
  • 10 years
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Which of the following conditions should be avoided in yam storage areas?

  • Ventilation
  • Darkness
  • Correct Answer
    High humidity combined with poor ventilation
  • Cool temperatures
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What storage technique is used to prevent rodent damage to stored yams?

  • Correct Answer
    Hanging individual tubers or using raised platforms with rat guards
  • Playing recorded cat sounds
  • Storing underwater
  • Coating tubers with hot pepper
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What causes the green discoloration that sometimes develops in stored yams?

  • Normal ripening process
  • Beneficial bacterial action
  • Exposure to sound waves
  • Correct Answer
    Exposure to light and development of chlorophyll
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Which physiological process continues during yam storage and affects storage duration?

  • Photosynthesis
  • Correct Answer
    Respiration and dormancy
  • Nitrogen fixation
  • Secondary tuber development
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Which method is used for commercial long-term storage of seed yams?

  • Freezing at -20°C
  • Vacuum sealing
  • Correct Answer
    Temperature-controlled storage with careful monitoring
  • Preservation in formaldehyde solution
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What key factor affects the storage life of different yam species?

  • Correct Answer
    Dormancy period characteristic to each species
  • Flesh color
  • Country of origin
  • Size only
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