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How to Identify and Classify Orange Trees
Contributed by: Crossley
  • 1. What is the most reliable way to initially identify an orange tree?
A) Smell the blossoms.
B) Examine the fruit and leaves.
C) Measure the tree's height.
D) Check the bark color.
  • 2. What leaf characteristic is common among most orange tree varieties?
A) Perfectly round shape.
B) Deeply lobed edges.
C) Needle-like foliage.
D) Elliptical shape with a pointed tip.
  • 3. What type of fruit is an orange?
A) Berry
B) Hesperidium
C) Pome
D) Drupe
  • 4. Which orange type is known for its 'navel' at the blossom end?
A) Mandarin Orange
B) Navel Orange
C) Blood Orange
D) Valencia Orange
  • 5. What is the primary characteristic of a Blood Orange?
A) Thick, bumpy skin
B) Extremely sour taste
C) Seedless fruit
D) Reddish-colored flesh
  • 6. Which orange variety is typically used for juice due to its thin skin and high juice content?
A) Navel Orange
B) Valencia Orange
C) Seville Orange
D) Tangerine
  • 7. What is a key difference between oranges and mandarins?
A) Mandarins have thicker skin.
B) Oranges are always seedless.
C) Mandarins are easier to peel.
D) Oranges are generally smaller.
  • 8. What is the scientific name for the sweet orange?
A) Fortunella margarita
B) Citrus reticulata
C) Citrus aurantium
D) Citrus sinensis
  • 9. What is the primary use of Seville oranges?
A) Marmalade production
B) Juice concentrate
C) Essential oil extraction
D) Eating fresh
  • 10. What is the aroma of orange blossoms often described as?
A) Pungent and spicy
B) Sweet and citrusy
C) Faint and grassy
D) Earthy and musky
  • 11. What is a characteristic shared by all citrus trees?
A) Palm-like leaves
B) Evergreen foliage
C) Berry-like fruit
D) Deciduous foliage
  • 12. If a tree has fruit with a loose, easily peeled rind, it's likely a:
A) Lemon
B) Navel Orange
C) Grapefruit
D) Mandarin or Tangerine
  • 13. What does 'parthenocarpy' refer to in orange trees?
A) Rapid growth rate
B) Extremely fragrant blossoms
C) Fruit development without fertilization
D) Resistance to disease
  • 14. Which of the following is NOT a common rootstock used for grafting orange trees?
A) Cleopatra Mandarin
B) Trifoliate Orange
C) Oak
D) Sour Orange
  • 15. What does the term 'cold hardy' mean in relation to orange trees?
A) High fruit yield
B) Ability to tolerate freezing temperatures
C) Resistance to insect infestation
D) Tolerance to drought conditions
  • 16. What is a common pest that affects orange trees?
A) Earthworms
B) Aphids
C) Ladybugs
D) Bees
  • 17. What kind of soil do orange trees prefer?
A) Waterlogged, highly acidic
B) Well-draining, slightly acidic
C) Sandy, neutral
D) Heavy clay, alkaline
  • 18. What is the function of thorns on an orange tree?
A) Support for climbing
B) Attracting pollinators
C) Protection from herbivores
D) Aiding in water absorption
  • 19. What is the best time of year to prune most orange trees?
A) Any time of year
B) Late autumn
C) Mid-summer
D) Late winter or early spring
  • 20. What is a common disease affecting orange trees?
A) Citrus Greening (Huanglongbing)
B) Powdery Mildew
C) Dutch Elm Disease
D) Rose Black Spot
  • 21. The color of the orange fruit is primarily due to what pigment?
A) Anthocyanins
B) Melanin
C) Chlorophyll
D) Carotenoids
  • 22. What does 'self-fertile' mean for an orange tree?
A) It requires a different variety for pollination.
B) It only produces male flowers.
C) It can produce fruit without cross-pollination.
D) It is resistant to all diseases.
  • 23. What is the purpose of 'girdling' an orange tree?
A) To protect the trunk from sunburn.
B) To increase the tree's height.
C) To prevent root rot.
D) To encourage flowering and fruiting.
  • 24. Which orange variety is known for its use in marmalade production?
A) Tangerine
B) Valencia Orange
C) Navel Orange
D) Seville Orange
  • 25. What is the best way to determine the maturity of an orange?
A) Leaf color
B) Fruit size alone
C) Branch thickness
D) Taste test and skin color
  • 26. What is a common use for orange peels besides flavoring?
A) Fuel for vehicles
B) Animal feed
C) Building materials
D) Composting
  • 27. What is the expected lifespan of a well-cared-for orange tree?
A) 50-100 years
B) 10-20 years
C) 5-10 years
D) 1-2 years
  • 28. What nutrient is most important for flowering and fruit production in orange trees?
A) Calcium
B) Potassium
C) Phosphorus
D) Nitrogen
  • 29. What is the ideal pH range for soil when planting orange trees?
A) 9.0-10.0
B) 6.0-7.0
C) 3.0-4.0
D) 8.0-9.0
  • 30. What does 'HLB' stand for in the context of citrus diseases?
A) Healthy Leaf Bacteria
B) Huanglongbing
C) Hydrolyzed Lime Binding
D) High-Level Biocide
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