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