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