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