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Morphological responses of B. nigra upon exposure to ZnO and CuO nanoparticles. Error bars represent the SE (n = 6), and similar letters mean no statistical difference between treatments in Tukey’s test (p ≤ 0.05). (A, B) Plant height; (C, D) number of leaves/plant; and (E, F) number of branches/plant in the presence of ZnO and CuO NPs, respectively.
