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