Question 5 • PA Human Anatomy & Physiology A 2026-2027 SMITH IC
There is little sunlight at high latitudes during the winter, so few crops can grow even if temperatures are regulated. To address this problem, special lamps can be used in greenhouses. These lamps allow plants to grow during the winter months. Scientific knowledge of which topic was necessary to solve this problem?
Answer
A
the temperature that promotes the fastest growth in plants
B
the colors of light that plants require for photosynthesis
C
the frequencies of light that cause the least water loss in growing plants
D
the amount of heat generated by artificial lamps
Explanation
Plants need light for photosynthesis, the process that lets them make sugars and grow. Because winter sunlight is limited, greenhouse lamps must provide the colors of light plants can use for photosynthesis. Knowing the ideal temperature or how much heat lamps produce would not solve the lack of light itself.
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