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