Wasabi - Quiz
Wasabi
  • 1. What type of water is required for optimal water wasabi growth?
A) Stable, constantly flowing cool water
B) Fast-moving boiling water
C) Stagnant warm water
D) Deep ocean salt water
  • 2. Besides flowing cool water, what else do optimal conditions for water wasabi include?
A) Direct sunlight and dry soil
B) High salinity and high pressure
C) High quantity of dissolved oxygen and shade
D) Muddy water and heavy winds
  • 3. What is the general optimal air temperature range for wasabi?
A) 20 °C - 30 °C
B) 0 °C - 5 °C
C) 25 °C - 35 °C
D) 8 °C - 18 °C
  • 4. Which specific air temperature range is cited by some studies as the ideal range for wasabi?
A) 22 °C - 25 °C
B) 12 °C - 15 °C
C) 18 °C - 22 °C
D) 5 °C - 8 °C
  • 5. What happens to the wasabi plant at air temperatures above 28 °C?
A) Rapid flowering and sweetening
B) Heat damage and soft rot
C) Increased cold tolerance
D) Enhanced root growth
  • 6. Which pathogen is associated with soft rot in wasabi during high heat?
A) Erwinia sp.
B) Pseudomonas syringae
C) Rhizopus stolonifer
D) Botrytis cinerea
  • 7. What effect do cold air temperatures below 8 °C have on wasabi?
A) Stimulate rhizome growth
B) Inhibit plant growth
C) Cause soft rot
D) Increase shoot development
  • 8. What is the ideal water temperature for wasabi?
A) 15 °C - 20 °C
B) 5 °C - 8 °C
C) 10 °C - 13 °C
D) 20 °C - 25 °C
  • 9. What oxygen level is required for wasabi roots for good growing conditions?
A) Between 1 and 2 ppm
B) Below 5 ppm
C) Above 9 ppm
D) Exactly 3 ppm
  • 10. At what water temperature do the required oxygenation levels for wasabi occur?
A) At exactly 28 °C
B) Below 20 °C
C) Between 30 °C and 35 °C
D) Above 25 °C
  • 11. How are plant nutrients supplied to water wasabi?
A) By aerial misting only
B) By flowing water
C) By direct sunlight absorption
D) By solid soil injection
  • 12. Which two nutrients are particularly important for wasabi growth?
A) Nitrogen and sulfur
B) Calcium and magnesium
C) Iron and zinc
D) Phosphorus and potassium
  • 13. Optimal wasabi growth has been documented with combined nitrogen supplementation and what amount of sulfur?
A) Lower amounts of sulfur
B) Equal amounts of sulfur
C) Massive amounts of sulfur
D) Zero sulfur
  • 14. What nitrogen concentration was found to increase plant height, shoot development, and rhizome growth?
A) 1000 mg/L
B) 50 mg/L
C) 300 mg/L
D) 10 mg/L
  • 15. What sulfur level, combined with nitrogen, increased plant height, shoot development, and rhizome growth?
A) 100 mg/L
B) 1000 mg/L
C) 500 mg/L
D) 10 mg/L
  • 16. Why is no additional fertilizer needed at the famous Daio Wasabi Farm?
A) Due to runoff from upstream rice paddies
B) Because fertilizers are prohibited by law
C) Because the soil is naturally volcanic
D) Due to heavy rainfall
  • 17. What do wasabi growers in Shizuoka apply monthly into the water supply?
A) A slow-release 12:12:12 fertilizer
B) Ammonium nitrate solution
C) Pure sulfur crystals
D) Liquid nitrogen
  • 18. What do Shizuoka wasabi growers spray the foliage with?
A) Ammonium chloride
B) Hoagland solution
C) Sulfate fertilizer
D) Pesticide
  • 19. According to hydroponic experiments, what type of nutrient concentration does wasabi prefer?
A) High nutrient concentrations
B) Low nutrient concentrations
C) Extremely saturated nutrients
D) Zero nutrients
  • 20. What strength of Hoagland solution resulted in optimal wasabi growth during hydroponic experiments?
A) Triple strength
B) Full strength
C) 1/10–1/2 strength
D) Double strength
  • 21. What ratio of ammonium to nitrate nitrogen produced the best results in experiments?
A) 90:10 ratio
B) 10:90 ratio
C) 100:0 ratio
D) 50:50 ratio
  • 22. What optimal pH level led to the highest shoot, root, and rhizome growth?
A) Around 7.8
B) Around 6.0
C) Around 8.5
D) Around 4.0
  • 23. How should the nutrient solution be managed under greenhouse conditions?
A) Continuously aerated and renewed weekly
B) Heated and filtered daily
C) Stagnant and replaced monthly
D) Sealed and never replaced
  • 24. How is wasabi generally characterized regarding ammonium and nitrate?
A) Neutral to both forms
B) Averse to all nitrogen forms
C) Ammonium-preferring and nitrate-sensitive
D) Ammonium-sensitive and nitrate-preferring
  • 25. What is wasabi's overall nutrient demand considered to be?
A) Unpredictable nutrient demand
B) Relatively low nutrient demand
C) Non-existent nutrient demand
D) Extremely high nutrient demand
  • 26. What common side effect can occur from eating raw fresh wasabi leaves?
A) Diarrhea
B) Nausea
C) Headache
D) Dizziness
  • 27. What is wasabizuke made of?
A) Grated wasabi root mixed with vinegar
B) Dried wasabi powder soaked in rice wine
C) Wasabi leaves pickled in sake lees
D) Fermented wasabi stems in soy sauce
  • 28. Wasabizuke is considered a specialty of which prefecture?
A) Tokyo Prefecture
B) Kyoto Prefecture
C) Osaka Prefecture
D) Shizuoka Prefecture
  • 29. What is the primary difference between wasabi and its common substitutes?
A) Wasabi is naturally green
B) Substitutes have a longer-lasting oil-based burn
C) Substitutes are much spicier than real wasabi
D) Wasabi has no pungent aftertaste
  • 30. What is horseradish referred to as in Japan?
A) Hon wasabi
B) Kona wasabi
C) Aka wasabi
D) Seiyō wasabi
  • 31. What chemical provides wasabi's initial pungency?
A) Allyl isothiocyanate
B) Methylthioalkyl
C) Sinigrin
D) Capsaicin
  • 32. Allyl isothiocyanate is produced by the hydrolysis of what compound?
A) Capsanthin
B) Glucose
C) Allyl glucosinolate
D) Myrosinase
  • 33. What enzyme catalyzes the hydrolysis reaction that produces allyl isothiocyanate?
A) Lipase
B) Pepsin
C) Amylase
D) Myrosinase
  • 34. Why does the wasabi plant release allyl isothiocyanate when damaged?
A) To accelerate leaf growth
B) To attract pollinators
C) To retain moisture during droughts
D) As a defense mechanism
  • 35. What is the chemosensory receptor that acts as the sensory neural target of mustard oil?
A) TRPA1
B) NMDA
C) GABA
D) TRPV1
  • 36. TRPA1 is also known by what name?
A) The pungency sensor
B) The capsaicin receptor
C) The spice detector
D) The wasabi receptor
  • 37. Which of the following is a breakdown product from the hydrolysis of thioglucosides in wasabi?
A) 6-(Methylsulfinyl)hexyl isothiocyanate
B) Capsaicinoid polymer
C) Piperine extract
D) Allyl caproate
  • 38. Why are the burning sensations of wasabi short-lived compared to capsaicin?
A) They evaporate into the air instantly
B) They are neutralized by saliva enzymes
C) They are not oil-based
D) They dissolve only in solid food
  • 39. Where is the burning sensation of wasabi felt primarily?
A) In the back of the throat
B) Along the roof of the mouth
C) In the nasal passage
D) On the tip of the tongue
  • 40. Inhaling or sniffing wasabi vapor has an effect similar to what substance?
A) Oxygen spray
B) Vapor rub
C) Ammonia gas
D) Smelling salts
  • 41. Wasabi vapor's effect was exploited by researchers attempting to create what device?
A) A personal air purifier
B) A smoke alarm for the deaf
C) A chemical weapon detector
D) An automatic fire sprinkler
  • 42. What prize was awarded in 2011 to the researchers studying wasabi vapor alarms?
A) The Breakthrough Prize in Life Sciences
B) The Kyoto Prize in Technology
C) The Nobel Prize in Physiology or Medicine
D) The Ig Nobel Prize in Chemistry
  • 43. What family does the wasabi plant belong to?
A) Brassicaceae
B) Fabaceae
C) Rosaceae
D) Solanaceae
  • 44. What part of the wasabi plant is primarily grown and used to make paste?
A) Leaves
B) Seeds
C) Rhizomes
D) Flowers
  • 45. What does wasabi stimulate more?
A) The throat
B) The tongue
C) The nose
D) The lips
  • 46. From what century does the oldest record of wasabi as a food date?
A) 8th century
B) 5th century
C) 12th century
D) 17th century
  • 47. When did the popularity of wasabi in English-speaking countries begin growing steadily?
A) About 1980
B) About 1950
C) About 2000
D) About 1920
  • 48. Who named Cochlearia (?) wasabi in 1830?
A) Miquel
B) Maximovich
C) Matsumura
D) Siebold
  • 49. Who first described the wasabi plant as Lunaria (?) japonica in 1866?
A) Matsumura
B) Koidzumi
C) Miquel
D) Siebold
  • 50. Who erected the genus Wasabia in 1899?
A) Maximovich
B) Koidzumi
C) Miquel
D) Matsumura
  • 51. Who transferred the wasabi plant to the genus Eutrema in 1930?
A) Matsumura
B) Koidzumi
C) Miquel
D) Siebold
  • 52. When do wasabi flowers begin to flower in Japan due to cold temperatures?
A) March
B) November
C) January
D) May
  • 53. When does sprouting of wasabi seeds typically begin in nature after winter dormancy?
A) June
B) April
C) December
D) February
  • 54. Traditionally, what is used to grate the fresh wasabi root?
A) Metal oroshigane
B) Coarse sharkskin
C) Stone blocks
D) Wooden graters
  • 55. What metal graters are used in modern times to grate wasabi?
A) Wasabi-mame
B) Oroshigane
C) Daruma
D) Mazuma
  • 56. What percentage of raw wasabi root consists of carbohydrates?
A) 0.63%
B) 23.5%
C) 4.8%
D) 69.1%
  • 57. What part of the water wasabi is it especially valued for?
A) Its large rhizome
B) Its leaves
C) Its flowers
D) Its seeds
  • 58. What medium is traditionally used instead of soil in wasabi growing methods?
A) Plastic sheets
B) Clay and topsoil
C) Solid concrete
D) A permeable medium
  • 59. What is the oldest traditional wasabi cultivation method mentioned?
A) Hokusun style
B) Keiryu style
C) Jizawa style
D) Tatamiishi style
  • 60. What terrain inclination is typically used in the Jizawa style cultivation method?
A) 15-20%
B) 3-4%
C) 1-2%
D) 10-12%
  • 61. In what year was the Tatamiishi style of wasabi cultivation introduced?
A) 1750
B) 1905
C) 1897
D) 1892
  • 62. What is the bottom layer of the Tatamiishi cultivation style composed of?
A) Soil
B) Sand
C) Large rocks
D) Pebbles
  • 63. What is the surface soil layer in the Tatamiishi style made of?
A) Clay
B) Gravel
C) Sand
D) Mud
  • 64. What is an improvement of the Tatamiishi style introduced in 1897 that uses drain pipes?
A) Jizawa style
B) Keiryu style
C) Hirachi style
D) Hokusun style
  • 65. Which cultivation style is known for efficiently making use of water in low-rainfall conditions?
A) Hirachi style
B) Tatamiishi style
C) Keiryu style
D) Jizawa style
  • 66. Traditional wasabi cultivation can be viewed as an early form of what modern technique?
A) Genetic modification
B) Aeroponics
C) Hydroponics
D) Crop rotation
  • 67. Which of the following is a common substrate used in modern hydroponics for wasabi?
A) Compost
B) Topsoil
C) Clay loam
D) Rockwool
  • 68. Which substance is used to treat or disinfect return flow in closed hydroponic systems?
A) Ammonia
B) Chlorine bleach
C) Sodium chloride
D) Ozone
  • 69. What radiation type is used for disinfection in modern hydroponic return flow treatment?
A) Gamma radiation
B) X-ray radiation
C) Ultraviolet radiation
D) Infrared radiation
  • 70. What process is used for the automated control of pH and nutrient composition in modern systems?
A) Irrigation
B) Filtration
C) Sublimation
D) Fertigation
  • 71. What does field wasabi require in addition to mild winters and cool summers?
A) Salty soil
B) High humidity
C) Direct sunlight
D) Good drainage
  • 72. How many traditional cultivars do modern cultivars of wasabi mostly derive from?
A) Five
B) Two
C) Three
D) Four
  • 73. Which of the following is one of the three traditional wasabi cultivars?
A) Hokkaido Green
B) Tokyo Gold
C) Fujidaruma
D) Kyushu Premium
  • 74. What genome sequencing supports the conclusion about modern wasabi cultivars?
A) Mitochondrial genome
B) Ribosomal genome
C) Chloroplastic genome
D) Nuclear genome
  • 75. How is the chloroplastic genome inherited in wasabi?
A) Maternally
B) Randomly
C) Biparentally
D) Paternally
  • 76. As far south as which Japanese location do artificial wasabi cultivation facilities exist?
A) Honshu
B) Okinawa
C) Kyushu
D) Shikoku
  • 77. As far north as which Japanese location do artificial wasabi cultivation facilities exist?
A) Aomori
B) Hokkaido
C) Niigata
D) Sendai
  • 78. Which country is NOT listed as an exporter of wasabi to Japan?
A) France
B) United States
C) Canada
D) Brazil
  • 79. What is the trend of domestic production of wasabi in Japan as of 2022?
A) Stays completely stable
B) Rapid increase
C) Continuous decline
D) Fluctuating unpredictably
  • 80. What reason is cited for the decline of domestic wasabi production in Japan?
A) Lack of farmers
B) Urban sprawl
C) Water pollution
D) Warming climate
  • 81. In which Chinese province is wasabi mostly produced?
A) Yunnan
B) Guangdong
C) Sichuan
D) Zhejiang
  • 82. What was the worth of wasabi leafstalk per metric ton in China as of 2023?
A) CNY 1500
B) CNY 5000
C) CNY 20000
D) CNY 3500
  • 83. What was the worth of wasabi rhizome per metric ton in China as of 2023?
A) CNY 35000
B) CNY 3500
C) CNY 10000
D) CNY 20000
  • 84. 10,000 mu of wasabi fields in China is equivalent to how many hectares?
A) 667 hectares
B) 2,000 hectares
C) 134 hectares
D) 1,000 hectares
  • 85. The wasabi field area in China is roughly what fraction of the global wasabi field area?
A) One-half
B) One-quarter
C) One-third
D) One-fifth
  • 86. How many hectares of fields does one particular company run in China?
A) 134 hectares
B) 50 hectares
C) 667 hectares
D) 300 hectares
  • 87. Which Japanese company grows water wasabi in Yunnan?
A) NISSAN
B) SONY
C) TOYOTA
D) ASUTA
  • 88. Which European country is listed as commercially growing wasabi?
A) Italy
B) Iceland
C) Spain
D) Greece
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