Fig. 6. (a) The role of silver concentration in the UV-vis spectra and (b) chlorophyll production. SEM image of a plant treated with ALAAgNP6. The two-sample t-test between water and ALA groups and between water and ALAAg groups - a highly significant p-value <0.001 (0.1%). (c) The role of ALA concentration in the UV-vis spectra and (d) chlorophyll production compared with ALAAgFeNP10. SEM of a Plant treated with ALAAgNP7. The difference between the average of the ALA and ALAAgNP8 populations is not big enough to be statistically significant; between ALA and other groups, p < 0.05 and statistically significant.