How to Identify and Classify Plums
  • 1. What is the primary fruit type of all plums?
A) Drupe
B) Aggregate Fruit
C) Berry
D) Pome
  • 2. Which characteristic is MOST important for initial plum identification?
A) Pit size
B) Skin color
C) Leaf shape
D) Branch thickness
  • 3. Japanese plums are scientifically classified under which species?
A) Prunus salicina
B) Prunus domestica
C) Prunus cerasifera
D) Prunus americana
  • 4. European plums are scientifically classified under which species?
A) Prunus americana
B) Prunus salicina
C) Prunus cerasifera
D) Prunus domestica
  • 5. Which plum species is known for its small size and often used for jams?
A) Prunus persica
B) Prunus americana
C) Prunus domestica
D) Prunus salicina
  • 6. What is a distinguishing characteristic of 'greengage' plums?
A) Red flesh
B) Very large size
C) Freestone pit
D) Green skin when ripe
  • 7. Which plum type is typically used for drying into prunes?
A) Cherry
B) American
C) European
D) Japanese
  • 8. A plum with a pointed end is most likely a...
A) Damson plum
B) European plum
C) Greengage plum
D) Japanese plum
  • 9. What pit type is most common in Japanese plums?
A) Freestone
B) Semi-freestone
C) No pit
D) Clingstone
  • 10. What pit type is most common in European plums?
A) Freestone
B) Clingstone
C) No pit
D) Semi-freestone
  • 11. A 'bloom' on a plum refers to what?
A) Insect infestation
B) Fungal growth
C) Waxy coating on skin
D) Sugar crystals
  • 12. Which plum species is also known as the 'cherry plum'?
A) Prunus americana
B) Prunus domestica
C) Prunus salicina
D) Prunus cerasifera
  • 13. The flavor profile of most European plums is generally...
A) More tart and acidic
B) Sweeter and less tart
C) Bland
D) Similar to cherries
  • 14. The flavor profile of most Japanese plums is generally...
A) Mild and sweet
B) Tart and complex
C) Bland
D) Similar to apples
  • 15. What leaf characteristic helps identify plum trees?
A) Needle-like leaves
B) Smooth leaf edges
C) Compound leaves
D) Serrations along the leaf edge
  • 16. Which ripening time best describes European plums?
A) Late summer to fall
B) Winter
C) Early spring
D) Mid-summer
  • 17. Which ripening time best describes Japanese plums?
A) Early to mid-summer
B) Late fall
C) Winter
D) Late summer to fall
  • 18. What color is the flesh of 'Santa Rosa' plums?
A) Purple
B) Green
C) Amber to red
D) Yellow
  • 19. Which factor affects plum size most significantly?
A) Rainfall amount
B) Cultivar
C) Soil type
D) Tree age
  • 20. How does chilling requirement affect plum cultivar selection?
A) Determines the skin color
B) Determines the sweetness of the fruit
C) Determines suitability for the climate
D) Determines the size of the fruit
  • 21. The shape of European plums is generally...
A) Heart-shaped
B) Oval
C) Round
D) Pear-shaped
  • 22. What does 'self-fertile' mean in the context of plum trees?
A) Grows in very poor soil
B) Needs no water
C) Can pollinate itself
D) Requires a separate pollinator
  • 23. A small, tart plum with dark blue skin is likely a...
A) Elephant Heart
B) Damson
C) Santa Rosa
D) Greengage
  • 24. Which tool is best for determining the sugar content of a plum?
A) Soil pH meter
B) Microscope
C) Tape measure
D) Refractometer
  • 25. What does 'precocity' refer to in plum trees?
A) Rapid growth rate
B) Tolerance to drought
C) Bearing fruit early in life
D) Resistance to disease
  • 26. Compared to Japanese plums, European plum trees generally...
A) Bear fruit faster
B) Require less pruning
C) Are more cold hardy
D) Have a longer lifespan
  • 27. What is the most common use of myrobalan plums?
A) Drying
B) Jam making
C) Fresh eating
D) Rootstock for grafting
  • 28. A large plum with a dark purple skin and red flesh is likely a...
A) Santa Rosa plum
B) Elephant Heart plum
C) Stanley plum
D) Damson plum
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