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