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  3. Much of the research on nutrient deficiencies is based on growing plants hydro-ponically, that is, in soilless liquid nutrient s

Much of the research on nutrient deficiencies is based on growing plants hydro-ponically, that is, in soilless liquid nutrient s

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问题     Much of the research on nutrient deficiencies is based on growing plants hydro-ponically, that is, in soilless liquid nutrient solutions. This technique allows researchers to create solutions that selectively omit certain nutrients and then observe the resulting effects on the plants. Hydroponics has applications beyond basic research, since it facilitates the growing of greenhouse vegetables during winter. Aeroponics, a technique in which plants are suspended and the roots misted with a nutrient solution, is another method for growing plants without soil.
According to paragraph 3, what is the advantage of hydroponics for research on nutrient deficiencies in plants?
选项 A、It allows researchers to control what nutrients a plant receives.
B、It allows researchers to observe the growth of a large number of plants simultaneously.
C、It is possible to directly observe the roots of plants.
D、It is unnecessary to keep misting plants with nutrient solutions.
答案A
解析
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