in the experiment hydrotropism, why entire system is enclosed with transparent plastic container?
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Humidity-based experimental system of hydrotropism. (A) An experimental system for the study of hydrotropism in Arabidopsis roots. Seedlings were pretreated on inhibitor-containing 1% agar plates, which were then placed in a closed acrylic container in such a way that the root tips (0.2 mm in length) were suspended in air. The container was maintained in a vertical position for the course of the experiment. A plastic container of saturated K 2 CO 3 solution was placed on the floor of the chamber, establishing a moisture gradient between it and the agar
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