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Subel. Y7
11 questions
Subelement Y7

YAM SCIENCE

Section Y7A

Botanical characteristics

What plant family do true yams (Dioscorea spp.) belong to?

  • Solanaceae
  • Correct Answer
    Dioscoreaceae
  • Convolvulaceae
  • Poaceae
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Which of the following best describes the growth habit of yam plants?

  • Herbaceous shrubs with no climbing ability
  • Trees with hanging tubers
  • Ground-hugging vines that never climb
  • Correct Answer
    Climbing or trailing vines with underground tubers
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What is the primary storage organ of yam plants?

  • Correct Answer
    Tuber
  • Rhizome
  • Stem
  • Leaf
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Which part of the yam plant contains chlorophyll and is responsible for photosynthesis?

  • Tuber
  • Roots
  • Correct Answer
    Leaves
  • Underground stem
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What is the botanical term for aerial tubers produced by some Dioscorea species?

  • Cladodes
  • Correct Answer
    Bulbils
  • Phyllodes
  • Thalli
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What is distinctive about the venation pattern on most yam leaves?

  • Parallel venation only
  • No visible veins
  • Random vein arrangement
  • Correct Answer
    Heart-shaped with prominent veins converging at the base
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What anatomical feature allows yams to store large amounts of starch?

  • Correct Answer
    Specialized parenchyma cells in the tuber
  • Hollow cavities filled with starch granules
  • External starch sacs attached to roots
  • Specialized carbon-fixing stems
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What secondary metabolites are found in some wild yam species that require processing before consumption?

  • Capsaicin
  • Caffeine
  • Correct Answer
    Alkaloids and saponins
  • Anthocyanins
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What type of root system do yam plants typically possess?

  • Taproot system only
  • Correct Answer
    Fibrous roots arising from the tuber
  • No roots, only tubers
  • Pneumatophores (breathing roots)
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Which of the following is NOT a characteristic of yam flowers?

  • Small in size
  • Separate male and female plants in many species
  • Wind pollination
  • Correct Answer
    Bright colors to attract insect pollinators
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What is the ploidy level of many cultivated yam species?

  • Correct Answer
    Polyploid (multiple sets of chromosomes)
  • Always diploid (two sets of chromosomes)
  • Always haploid (one set of chromosomes)
  • Zero chromosomes (acellular)
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