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Subel. Y7
9 questions
Subelement Y7

YAM SCIENCE

Section Y7B

Propagation biology

What is the primary method of propagation for cultivated yams?

  • Seeds
  • Stem cuttings
  • Correct Answer
    Vegetative propagation using tuber pieces
  • Grafting
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Why is sexual reproduction (from seeds) less common in cultivated yam production?

  • Correct Answer
    Many cultivated varieties rarely flower or produce viable seeds
  • Yam seeds germinate only underwater
  • Yam seeds must pass through an animal's digestive tract to germinate
  • Yam seeds exist only in theory and have never been observed
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What technique is used in the "minisett" system of yam propagation?

  • Using miniature yam seedlings
  • Planting yams in small containers only
  • Planting entire small tubers without cutting
  • Correct Answer
    Cutting tubers into small pieces with at least one bud
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What is the primary advantage of propagating yams through tissue culture?

  • It is the simplest technique for subsistence farmers
  • Correct Answer
    It can produce disease-free planting material
  • It eliminates the need for soil
  • It produces tubers that never need harvesting
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What dormancy factor must be overcome for yam tubers to sprout?

  • Exposure to subfreezing temperatures
  • Submersion in salt water
  • Correct Answer
    Completion of a rest period that varies by species
  • Exposure to intense ultraviolet radiation
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What technique is used to break dormancy and promote sprouting in seed yams?

  • Correct Answer
    Proper curing and storage under appropriate temperature and humidity
  • Exposure to X-rays
  • Treatment with growth-inhibiting hormones
  • Submersion in boiling water
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What is unique about the propagation of Dioscorea bulbifera (air potato)?

  • It can only be propagated from seeds
  • It requires grafting onto wild species
  • It must be propagated underwater
  • Correct Answer
    It can be propagated from aerial bulbils
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What factor most affects the sprouting of yam setts?

  • Moon phase during planting
  • Correct Answer
    Presence of viable buds and proper moisture conditions
  • Geographical direction they are pointed during planting
  • Color of the soil they are planted in
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What physiological process must occur for a yam tuber piece to regenerate into a complete plant?

  • Mitosis must cease completely
  • The piece must first produce seeds
  • Correct Answer
    Activation of dormant buds to produce new shoots and roots
  • Complete genetic recombination
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