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How to Identify and Classify Walnut Trees
Contributed by: Crossley
  • 1. What is the most distinguishing characteristic of walnut leaves?
A) Palmately compound leaves
B) Simple, opposite leaves
C) Pinnately compound leaves
D) Needle-like leaves
  • 2. How are walnut leaves typically arranged on the branch?
A) Oppositely
B) Whorled
C) Basal
D) Alternately
  • 3. What type of fruit does a walnut tree produce?
A) A nut
B) A drupe
C) A pome
D) A berry
  • 4. Which of these is a common species of walnut tree?
A) Juglans nigra (Black Walnut)
B) Quercus alba (White Oak)
C) Betula papyrifera (Paper Birch)
D) Acer rubrum (Red Maple)
  • 5. What is the color of the pith in a Black Walnut twig?
A) Dark brown
B) Pink
C) White
D) Green
  • 6. How can you differentiate between Black Walnut and Butternut (Juglans cinerea) using their nuts?
A) They are indistinguishable based on nuts.
B) Black Walnut nuts are smoother and easier to crack.
C) Black Walnut nuts are rounder and harder to crack.
D) Butternut nuts are rounder and harder to crack.
  • 7. What is the bark texture of a mature Black Walnut tree?
A) Smooth
B) Peeling
C) Deeply furrowed
D) Papery
  • 8. What is the typical habitat for Black Walnut trees?
A) High altitude, rocky terrain
B) Dry, sandy soil
C) Swampy areas
D) Rich, well-drained soil
  • 9. What is the shape of the leaf scar on a walnut twig?
A) Round
B) U-shaped
C) V-shaped
D) Triangular
  • 10. Walnut trees belong to which plant family?
A) Juglandaceae
B) Fagaceae
C) Rosaceae
D) Betulaceae
  • 11. What is the growth rate of a Black Walnut tree?
A) Very slow
B) Extremely fast
C) Slow
D) Moderate to fast
  • 12. Which walnut species has a sticky or resinous coating on its new growth?
A) Japanese Walnut (Juglans ailantifolia)
B) Butternut (Juglans cinerea)
C) Black Walnut (Juglans nigra)
D) English Walnut (Juglans regia)
  • 13. What is the primary use of Black Walnut wood?
A) Construction lumber
B) High-end furniture and gunstocks
C) Firewood
D) Paper pulp
  • 14. What is juglone?
A) A type of walnut fungus
B) A toxic substance produced by walnuts
C) A walnut fertilizer
D) A synonym for walnut fruit
  • 15. What impact does juglone have on other plants?
A) Has no effect on other plants
B) Stimulates the growth of all plants
C) Kills all other plants
D) Inhibits the growth of some plants
  • 16. How many leaflets are typically found on a Black Walnut leaf?
A) 25-30
B) 3-5
C) 15-23
D) 7-11
  • 17. Where are the male flowers (catkins) located on a walnut tree?
A) On the trunk
B) On new growth
C) At the base of the tree
D) On last year's growth
  • 18. What is the appearance of Butternut bark compared to Black Walnut bark?
A) Butternut bark is smoother with broader ridges.
B) Butternut bark is darker and more furrowed.
C) Butternut bark is identical to Black Walnut bark.
D) Butternut bark is lighter and more peeling.
  • 19. What is a common disease affecting Butternut trees?
A) Oak wilt
B) Butternut canker
C) Pine blister rust
D) Dutch elm disease
  • 20. Which walnut species is most commonly grown for commercial nut production?
A) Japanese Walnut (Juglans ailantifolia)
B) Black Walnut (Juglans nigra)
C) Butternut (Juglans cinerea)
D) English Walnut (Juglans regia)
  • 21. What is the shape of the nut of the English Walnut (Juglans regia)?
A) Oval and rough
B) Elongated and pointed
C) Round and symmetrical
D) Irregular and flattened
  • 22. Which of the following characteristics can help distinguish between different walnut species' twigs in the winter?
A) Leaf color
B) Fruit presence
C) Bud shape and size
D) Tree height
  • 23. What is the ecological role of walnut trees?
A) Provide food and habitat for wildlife
B) None - they are invasive
C) Erosion control only
D) Solely timber production
  • 24. What is the arrangement of the buds on a walnut twig?
A) Subopposite
B) Alternate
C) Opposite
D) Whorled
  • 25. What is the typical color of the husk surrounding a black walnut?
A) Yellow
B) Bright red
C) Greenish-brown
D) Pure white
  • 26. What is the terminal leaflet like on a Black Walnut leaf?
A) Often missing or reduced
B) Brightly colored
C) Always folded
D) Always present and large
  • 27. What does 'monoecious' mean in relation to walnut trees?
A) Having perfect flowers (both male and female parts in one flower)
B) Having only female flowers
C) Having only male flowers
D) Having separate male and female flowers on the same tree
  • 28. How can the aroma of crushed walnut leaves be described?
A) Distinct and pungent
B) Like citrus
C) Odorless
D) Sweet and floral
  • 29. What is the significance of the chambered pith in walnut twigs?
A) It helps distinguish walnut from similar trees
B) It is insignificant
C) It indicates disease
D) It provides nutrients to the tree
  • 30. What is the approximate lifespan of a Black Walnut tree?
A) Over 500 years
B) 20-50 years
C) 50-100 years
D) 100-200 years
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