Multiple choice Greenhouse is ______. a building of glass in which temperature is very low a building in which green plants are cultivated a building chiefly of glass in which temperature is maintained within the desired range none of these Reveal answer Fill a bubble to check yourself C Correct answer Explanation A greenhouse is a structure made primarily of glass that allows sunlight in while trapping heat to maintain temperature within a desired range for plant cultivation. The glass acts as a selective transmitter of solar radiation.