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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) Check the bark color.
B) Smell the blossoms.
C) Measure the tree's height.
D) Examine the fruit and leaves.
  • 2. What leaf characteristic is common among most orange tree varieties?
A) Deeply lobed edges.
B) Perfectly round shape.
C) Elliptical shape with a pointed tip.
D) Needle-like foliage.
  • 3. What type of fruit is an orange?
A) Berry
B) Pome
C) Drupe
D) Hesperidium
  • 4. Which orange type is known for its 'navel' at the blossom end?
A) Navel Orange
B) Valencia Orange
C) Blood Orange
D) Mandarin Orange
  • 5. What is the primary characteristic of a Blood Orange?
A) Seedless fruit
B) Reddish-colored flesh
C) Extremely sour taste
D) Thick, bumpy skin
  • 6. Which orange variety is typically used for juice due to its thin skin and high juice content?
A) Seville Orange
B) Tangerine
C) Navel Orange
D) Valencia Orange
  • 7. What is a key difference between oranges and mandarins?
A) Oranges are generally smaller.
B) Oranges are always seedless.
C) Mandarins have thicker skin.
D) Mandarins are easier to peel.
  • 8. What is the scientific name for the sweet orange?
A) Citrus reticulata
B) Fortunella margarita
C) Citrus aurantium
D) Citrus sinensis
  • 9. What is the primary use of Seville oranges?
A) Essential oil extraction
B) Juice concentrate
C) Marmalade production
D) Eating fresh
  • 10. What is the aroma of orange blossoms often described as?
A) Pungent and spicy
B) Faint and grassy
C) Earthy and musky
D) Sweet and citrusy
  • 11. What is a characteristic shared by all citrus trees?
A) Deciduous foliage
B) Palm-like leaves
C) Evergreen foliage
D) Berry-like fruit
  • 12. If a tree has fruit with a loose, easily peeled rind, it's likely a:
A) Navel Orange
B) Lemon
C) Grapefruit
D) Mandarin or Tangerine
  • 13. What does 'parthenocarpy' refer to in orange trees?
A) Resistance to disease
B) Fruit development without fertilization
C) Rapid growth rate
D) Extremely fragrant blossoms
  • 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) Tolerance to drought conditions
D) Resistance to insect infestation
  • 16. What is a common pest that affects orange trees?
A) Bees
B) Earthworms
C) Aphids
D) Ladybugs
  • 17. What kind of soil do orange trees prefer?
A) Waterlogged, highly acidic
B) Sandy, neutral
C) Well-draining, slightly acidic
D) Heavy clay, alkaline
  • 18. What is the function of thorns on an orange tree?
A) Aiding in water absorption
B) Attracting pollinators
C) Protection from herbivores
D) Support for climbing
  • 19. What is the best time of year to prune most orange trees?
A) Late winter or early spring
B) Any time of year
C) Mid-summer
D) Late autumn
  • 20. What is a common disease affecting orange trees?
A) Dutch Elm Disease
B) Citrus Greening (Huanglongbing)
C) Rose Black Spot
D) Powdery Mildew
  • 21. The color of the orange fruit is primarily due to what pigment?
A) Chlorophyll
B) Melanin
C) Carotenoids
D) Anthocyanins
  • 22. What does 'self-fertile' mean for an orange tree?
A) It only produces male flowers.
B) It is resistant to all diseases.
C) It can produce fruit without cross-pollination.
D) It requires a different variety for pollination.
  • 23. What is the purpose of 'girdling' an orange tree?
A) To protect the trunk from sunburn.
B) To encourage flowering and fruiting.
C) To prevent root rot.
D) To increase the tree's height.
  • 24. Which orange variety is known for its use in marmalade production?
A) Seville Orange
B) Navel Orange
C) Tangerine
D) Valencia Orange
  • 25. What is the best way to determine the maturity of an orange?
A) Leaf color
B) Branch thickness
C) Fruit size alone
D) Taste test and skin color
  • 26. What is a common use for orange peels besides flavoring?
A) Building materials
B) Animal feed
C) Composting
D) Fuel for vehicles
  • 27. What is the expected lifespan of a well-cared-for orange tree?
A) 50-100 years
B) 10-20 years
C) 1-2 years
D) 5-10 years
  • 28. What nutrient is most important for flowering and fruit production in orange trees?
A) Calcium
B) Nitrogen
C) Phosphorus
D) Potassium
  • 29. What is the ideal pH range for soil when planting orange trees?
A) 9.0-10.0
B) 6.0-7.0
C) 8.0-9.0
D) 3.0-4.0
  • 30. What does 'HLB' stand for in the context of citrus diseases?
A) Huanglongbing
B) Hydrolyzed Lime Binding
C) Healthy Leaf Bacteria
D) High-Level Biocide
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