How to Identify and Classify Orange Trees
  • 1. What is the most reliable way to initially identify an orange tree?
A) Measure the tree's height.
B) Examine the fruit and leaves.
C) Smell the blossoms.
D) Check the bark color.
  • 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) Hesperidium
B) Berry
C) Drupe
D) Pome
  • 4. Which orange type is known for its 'navel' at the blossom end?
A) Blood Orange
B) Mandarin Orange
C) Valencia Orange
D) Navel Orange
  • 5. What is the primary characteristic of a Blood Orange?
A) Seedless fruit
B) Thick, bumpy skin
C) Reddish-colored flesh
D) Extremely sour taste
  • 6. Which orange variety is typically used for juice due to its thin skin and high juice content?
A) Tangerine
B) Seville Orange
C) Navel Orange
D) Valencia Orange
  • 7. What is a key difference between oranges and mandarins?
A) Mandarins have thicker skin.
B) Mandarins are easier to peel.
C) Oranges are generally smaller.
D) Oranges are always seedless.
  • 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) Eating fresh
D) Marmalade production
  • 10. What is the aroma of orange blossoms often described as?
A) Faint and grassy
B) Earthy and musky
C) Pungent and spicy
D) Sweet and citrusy
  • 11. What is a characteristic shared by all citrus trees?
A) Deciduous foliage
B) Evergreen foliage
C) Berry-like fruit
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) Rapid growth rate
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) Oak
C) Trifoliate Orange
D) Sour Orange
  • 15. What does the term 'cold hardy' mean in relation to orange trees?
A) Resistance to insect infestation
B) Tolerance to drought conditions
C) Ability to tolerate freezing temperatures
D) High fruit yield
  • 16. What is a common pest that affects orange trees?
A) Earthworms
B) Ladybugs
C) Aphids
D) Bees
  • 17. What kind of soil do orange trees prefer?
A) Heavy clay, alkaline
B) Sandy, neutral
C) Well-draining, slightly acidic
D) Waterlogged, highly acidic
  • 18. What is the function of thorns on an orange tree?
A) Aiding in water absorption
B) Attracting pollinators
C) Support for climbing
D) Protection from herbivores
  • 19. What is the best time of year to prune most orange trees?
A) Late autumn
B) Any time of year
C) Mid-summer
D) Late winter or early spring
  • 20. What is a common disease affecting orange trees?
A) Powdery Mildew
B) Citrus Greening (Huanglongbing)
C) Dutch Elm Disease
D) Rose Black Spot
  • 21. The color of the orange fruit is primarily due to what pigment?
A) Chlorophyll
B) Melanin
C) Anthocyanins
D) Carotenoids
  • 22. What does 'self-fertile' mean for an orange tree?
A) It only produces male flowers.
B) It can produce fruit without cross-pollination.
C) It is resistant to all diseases.
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 prevent root rot.
C) To increase the tree's height.
D) To encourage flowering and fruiting.
  • 24. Which orange variety is known for its use in marmalade production?
A) Valencia Orange
B) Navel Orange
C) Seville Orange
D) Tangerine
  • 25. What is the best way to determine the maturity of an orange?
A) Fruit size alone
B) Leaf color
C) Taste test and skin color
D) Branch thickness
  • 26. What is a common use for orange peels besides flavoring?
A) Composting
B) Fuel for vehicles
C) Building materials
D) Animal feed
  • 27. What is the expected lifespan of a well-cared-for orange tree?
A) 10-20 years
B) 1-2 years
C) 5-10 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) 6.0-7.0
B) 8.0-9.0
C) 3.0-4.0
D) 9.0-10.0
  • 30. What does 'HLB' stand for in the context of citrus diseases?
A) High-Level Biocide
B) Healthy Leaf Bacteria
C) Hydrolyzed Lime Binding
D) Huanglongbing
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