“…Rizwan et al (2019) stated that Zn NPs alleviated cadmium stress in wheat by enhancing growth, chlorophyll contents, gas exchange as well as curtailing the oxidative stress. Furthermore, zinc and copper nanoparticles promoted the drought resistance of two wheat cultivars at seedling stage via stabilizing the photosynthetic pigments, enhancing leaf water content, rising of antioxidative enzyme activity and slow down lipid peroxidation (Taran et al, 2017). Various studies recommended that ZnO NPs at a size lower than100 nm positively promoted biomass, yield, and nutrient content of many crops as cucumber (Zhao et al, 2013); peanuts (Prasad et al, 2012); cauliflower, cabbage, and tomato (Singh et al, 2013); and common chickpea (Pandey et al, 2010).…”