. 70umol 24% At the beginning, they both start in 100%, later on, NVP descends further to reach 58/59% but ZDV stays in 62%. Then, when they both reach the 100 umol NVP affects the root growth less than the ZDV. They end up affecting it the same in 200 umol. After this, we realise that ZDV influences and decreases the root length more than the NVP. y Because even if it has the influence of drugs in it, the mitosis that was happening before these got in the way, is still happening and is going to be able to finish the process . Because of the tissue being damaged the mitotic index grows so it can heal what was damaged.