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How to Identify and Classify Soybeans
Contributed by: Woolley
  • 1. Which characteristic is MOST important for initial soybean identification?
A) Seed shape and hilum color
B) Stem thickness
C) Root depth
D) Leaf size
  • 2. What is the hilum of a soybean?
A) The scar where the seed was attached to the pod
B) The outer shell of the soybean
C) The growing tip of the soybean plant
D) A type of soybean disease
  • 3. Common hilum colors include:
A) Red, blue, green
B) Black, brown, buff
C) Purple, orange, yellow
D) Pink, silver, gold
  • 4. Soybean seed shape is typically:
A) Spherical or oval
B) Irregular or flattened
C) Elongated or rectangular
D) Triangular or square
  • 5. Maturity groups for soybeans are classified by:
A) Average temperature and humidity
B) Latitude and photoperiod
C) Soil type and rainfall
D) Fertilizer application rates
  • 6. What is the primary factor determining a soybean's maturity group?
A) Altitude
B) Day length sensitivity
C) Seed size
D) Soil nutrient availability
  • 7. Which maturity group would generally be planted EARLIEST in the spring in the US?
A) Group IX
B) Group III
C) Group 00
D) Group V
  • 8. Later maturity groups (e.g., Group V and above) are best suited for:
A) Sandy soils
B) Lower latitudes
C) High altitudes
D) Higher latitudes
  • 9. Leaflet shape and size can:
A) Indicate soil pH level
B) Vary among varieties
C) Be used to determine disease resistance
D) Predict yield potential directly
  • 10. Soybean pubescence refers to:
A) The color of the soybean flower
B) A type of fungal disease affecting soybeans
C) The branching pattern of the root system
D) The small hairs on stems and leaves
  • 11. Pubescence color can be:
A) Yellow or orange
B) Red or blue
C) Gray or tawny
D) Green or purple
  • 12. Flower color in soybeans is typically:
A) Green or brown
B) Blue or orange
C) Purple or white
D) Red or yellow
  • 13. Growth habit in soybeans refers to:
A) Early or late maturing
B) Tall or short
C) Determinate or indeterminate
D) Bushy or vine-like
  • 14. Determinate soybean varieties:
A) Continue vegetative growth throughout flowering
B) Have very large seed size
C) Stop vegetative growth when flowering begins
D) Require less water than indeterminate varieties
  • 15. Indeterminate soybean varieties:
A) Produce smaller yields than determinate varieties
B) Continue vegetative growth during flowering
C) Stop vegetative growth before flowering begins
D) Are always resistant to disease
  • 16. Pod characteristics that can vary include:
A) Color, texture, and presence of thorns
B) Weight, density, and moisture content
C) Smell, taste, and nutritional content
D) Size, shape, and number of seeds per pod
  • 17. Disease resistance is determined through:
A) The type of fertilizer used
B) Field trials and laboratory testing
C) The maturity group of the soybean
D) Visual inspection of the seed
  • 18. A soybean variety is classified as Roundup Ready if it is resistant to:
A) 2,4-D
B) Glyphosate
C) Atrazine
D) Dicamba
  • 19. Seed size is typically measured as:
A) Seed circumference
B) Grams per seed
C) Volume per seed
D) Seeds per pound
  • 20. What federal agency regulates soybean variety labeling?
A) FDA
B) EPA
C) USDA
D) CDC
  • 21. What is the purpose of soybean variety registration?
A) To estimate yield
B) To track the genetic purity and characteristics
C) To control the market price
D) To prevent disease
  • 22. The term 'lodging' in soybeans refers to:
A) The bending or falling over of the plants
B) The rate of seed germination
C) The color of the soybean leaves
D) The formation of pods
  • 23. Which factor is LEAST relevant when initially identifying a soybean variety?
A) Hilum color
B) Root nodule count
C) Seed shape
D) Pubescence color
  • 24. What does 'MG' stand for in soybean classification?
A) Moisture Grade
B) Milligram
C) Maturity Group
D) Market Grade
  • 25. Which technology is used for soybean variety fingerprinting?
A) X-Ray Diffraction
B) Infrared Spectroscopy
C) Magnetic Resonance Imaging
D) DNA markers
  • 26. What is a key advantage of using certified soybean seed?
A) Guaranteed yield levels
B) Automatic disease resistance
C) Ensured genetic purity
D) Lower seed cost
  • 27. The ideal planting date for soybeans is often determined by:
A) Soil temperature
B) Air humidity
C) Wind speed
D) Barometric pressure
  • 28. Which type of soil is generally MOST suitable for soybean production?
A) Sandy
B) Clay
C) Peat
D) Loam
  • 29. What does the term 'shattering' refer to in soybean harvesting?
A) The loss of seed due to pod opening
B) The discoloration of the soybean leaves
C) The cracking of the seed coat
D) The breaking of the plant stem
  • 30. What is the typical protein content range of dry soybeans?
A) 10-15%
B) 20-25%
C) 38-45%
D) 50-55%
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