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