Zinc oxide (nano-ZnO) is a commonly used metal oxide ENPs. Zinc oxide is used in a range of
applications such as sunscreens and other personal care products, electrodes and biosensors [5],
photocatalysis and solar cells. Owing to increasing use in consumer products, it is likely that through both
deliberate application and accidental release, ENPs will find their way into aquatic, terrestrial and
atmospheric environments [6-8]. There is considerable concern about the potentially harmful effects of those
ENPs due to their unique properties, they may have significant effects on many organisms [2, 9], especially
plants which are essential base component of all ecosystem.