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