FFA Floriculture Practice Test

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Study for the FFA Floriculture Test. Access flashcards and multiple-choice questions for thorough preparation. Each question includes hints and explanations. Prepare to excel in your exam!

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In what units can light intensity be measured?

Lux
Foot-candles
Kelvins
Watts

The correct answer is: Foot-candles

Light intensity can indeed be measured in foot-candles, which is a unit that indicates the amount of light received on a surface from a light source. Specifically, one foot-candle is equivalent to one lumen per square foot, measuring how much illumination a surface is receiving. This unit is particularly relevant in horticulture and floriculture where the intensity of light affects plant growth, photosynthesis, and flowering. While lux is also a unit of illuminance similar to foot-candles, it is defined in metric terms (one lux equals one lumen per square meter). Kelvins measure the color temperature of light rather than its intensity, and watts measure the total energy output of a light source rather than the specific illumination on a surface. Thus, foot-candles are the appropriate choice for quantifying light intensity as it relates to the amount of light available to plants.