How to Identify and Classify Walnut Trees
  • 1. What is the most distinguishing characteristic of walnut leaves?
A) Pinnately compound leaves
B) Simple, opposite leaves
C) Palmately compound leaves
D) Needle-like leaves
  • 2. How are walnut leaves typically arranged on the branch?
A) Alternately
B) Basal
C) Oppositely
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) Quercus alba (White Oak)
B) Juglans nigra (Black Walnut)
C) Acer rubrum (Red Maple)
D) Betula papyrifera (Paper Birch)
  • 5. What is the color of the pith in a Black Walnut twig?
A) Green
B) Dark brown
C) White
D) Pink
  • 6. How can you differentiate between Black Walnut and Butternut (Juglans cinerea) using their nuts?
A) Black Walnut nuts are rounder and harder to crack.
B) They are indistinguishable based on nuts.
C) Black Walnut nuts are smoother and easier 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) Peeling
D) Deeply furrowed
  • 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) Round
B) V-shaped
C) U-shaped
D) Triangular
  • 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) Slow
B) Very slow
C) Moderate to fast
D) Extremely fast
  • 12. Which walnut species has a sticky or resinous coating on its new growth?
A) English Walnut (Juglans regia)
B) Black Walnut (Juglans nigra)
C) Japanese Walnut (Juglans ailantifolia)
D) Butternut (Juglans cinerea)
  • 13. What is the primary use of Black Walnut wood?
A) Construction lumber
B) Paper pulp
C) Firewood
D) High-end furniture and gunstocks
  • 14. What is juglone?
A) A type of walnut fungus
B) A walnut fertilizer
C) A toxic substance produced by walnuts
D) A synonym for walnut fruit
  • 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) 15-23
B) 7-11
C) 3-5
D) 25-30
  • 17. Where are the male flowers (catkins) located on a walnut tree?
A) On new growth
B) On the trunk
C) On last year's growth
D) At the base of the tree
  • 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 smoother with broader ridges.
D) Butternut bark is lighter and more peeling.
  • 19. What is a common disease affecting Butternut trees?
A) Butternut canker
B) Oak wilt
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) English Walnut (Juglans regia)
C) Butternut (Juglans cinerea)
D) Black Walnut (Juglans nigra)
  • 21. What is the shape of the nut of the English Walnut (Juglans regia)?
A) Round and symmetrical
B) Oval and rough
C) Elongated and pointed
D) Irregular and flattened
  • 22. Which of the following characteristics can help distinguish between different walnut species' twigs in the winter?
A) Bud shape and size
B) Leaf color
C) Fruit presence
D) Tree height
  • 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) Whorled
B) Opposite
C) Subopposite
D) Alternate
  • 25. What is the typical color of the husk surrounding a black walnut?
A) Pure white
B) Yellow
C) Bright red
D) Greenish-brown
  • 26. What is the terminal leaflet like on a Black Walnut leaf?
A) Often missing or reduced
B) Always present and large
C) Always folded
D) Brightly colored
  • 27. What does 'monoecious' mean in relation to walnut trees?
A) Having only male flowers
B) Having separate male and female flowers on the same tree
C) Having only female 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) Sweet and floral
B) Like citrus
C) Odorless
D) Distinct and pungent
  • 29. What is the significance of the chambered pith in walnut twigs?
A) It indicates disease
B) It provides nutrients to the tree
C) It is insignificant
D) It helps distinguish walnut from similar trees
  • 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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