The glass panel used in greenhouses is known to retain ________.
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A.
pH
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B.
heat
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C.
humidity
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D.
rainfall
Correct Answer:
B. heat
Explanation:
The greenhouse effect is primarily responsible for the warmth within a glass enclosure. Greenhouses are designed with glass panels that allow short-wavelength solar radiation to enter easily. Once this energy is absorbed by the plants and soil inside, it is re-emitted as long-wavelength infrared radiation. Because glass is opaque to these longer wavelengths, the thermal energy is trapped inside rather than escaping back into the atmosphere. This process effectively retains heat, maintaining a warmer internal temperature suitable for plant growth. Consequently, the glass panels are specifically known for their ability to retain heat.
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