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