A) Infrared rays
B) Ultraviolet rays
C) X-rays
D) Radio-waves
Correct Answer: A
Solution :
The green house is a room made of glass which is constructed to grow plants in open space. The glass transmits the infrared radiations of short wavelength and the visible light, but it absorbs die infrared radiations of long wavelength. During the day time the light and the infrared radiations of short wavelength enter inside the green house through die roof and the walls and they are absorbed by the plants. At night plants emit the infrared radiations through the glass wall and roof. As a result greenhouse remains warm. This is called greenhouse effect.
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