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) Basal
B) Oppositely
C) Alternately
D) Whorled
  • 3. What type of fruit does a walnut tree produce?
A) A pome
B) A berry
C) A drupe
D) A nut
  • 4. Which of these is a common species of walnut tree?
A) Betula papyrifera (Paper Birch)
B) Juglans nigra (Black Walnut)
C) Acer rubrum (Red Maple)
D) Quercus alba (White Oak)
  • 5. What is the color of the pith in a Black Walnut twig?
A) White
B) Green
C) Dark brown
D) Pink
  • 6. How can you differentiate between Black Walnut and Butternut (Juglans cinerea) using their nuts?
A) Butternut nuts are rounder and harder to crack.
B) Black Walnut nuts are smoother and easier to crack.
C) Black Walnut 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) Papery
C) Peeling
D) Deeply furrowed
  • 8. What is the typical habitat for Black Walnut trees?
A) High altitude, rocky terrain
B) Dry, sandy soil
C) Rich, well-drained soil
D) Swampy areas
  • 9. What is the shape of the leaf scar on a walnut twig?
A) Triangular
B) U-shaped
C) V-shaped
D) Round
  • 10. Walnut trees belong to which plant family?
A) Rosaceae
B) Juglandaceae
C) Betulaceae
D) Fagaceae
  • 11. What is the growth rate of a Black Walnut tree?
A) Very slow
B) Moderate to fast
C) Slow
D) Extremely fast
  • 12. Which walnut species has a sticky or resinous coating on its new growth?
A) Black Walnut (Juglans nigra)
B) Japanese Walnut (Juglans ailantifolia)
C) Butternut (Juglans cinerea)
D) English Walnut (Juglans regia)
  • 13. What is the primary use of Black Walnut wood?
A) High-end furniture and gunstocks
B) Paper pulp
C) Firewood
D) Construction lumber
  • 14. What is juglone?
A) A walnut fertilizer
B) A synonym for walnut fruit
C) A type of walnut fungus
D) A toxic substance produced by walnuts
  • 15. What impact does juglone have on other plants?
A) Has no effect on other plants
B) Kills all other plants
C) Inhibits the growth of some plants
D) Stimulates the growth of all plants
  • 16. How many leaflets are typically found on a Black Walnut leaf?
A) 25-30
B) 3-5
C) 7-11
D) 15-23
  • 17. Where are the male flowers (catkins) located on a walnut tree?
A) At the base of the tree
B) On last year's growth
C) On the trunk
D) On new 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 identical to Black Walnut bark.
D) Butternut bark is darker and more furrowed.
  • 19. What is a common disease affecting Butternut trees?
A) Pine blister rust
B) Butternut canker
C) Oak wilt
D) Dutch elm disease
  • 20. Which walnut species is most commonly grown for commercial nut production?
A) Butternut (Juglans cinerea)
B) English Walnut (Juglans regia)
C) Black Walnut (Juglans nigra)
D) Japanese Walnut (Juglans ailantifolia)
  • 21. What is the shape of the nut of the English Walnut (Juglans regia)?
A) Oval and rough
B) Round and symmetrical
C) Irregular and flattened
D) Elongated and pointed
  • 22. Which of the following characteristics can help distinguish between different walnut species' twigs in the winter?
A) Bud shape and size
B) Tree height
C) Fruit presence
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) Alternate
B) Opposite
C) Whorled
D) Subopposite
  • 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) Brightly colored
D) Always present and large
  • 27. What does 'monoecious' mean in relation to walnut trees?
A) Having separate male and female flowers on the same tree
B) Having only female flowers
C) Having perfect flowers (both male and female parts in one flower)
D) Having only male flowers
  • 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 helps distinguish walnut from similar trees
B) It indicates disease
C) It is insignificant
D) It provides nutrients to the tree
  • 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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