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