Despite how boring plants are on the multicellular stage, they are quite interesting on the molecular stage. Look at photosynthesis and cellular respiration for an example. Both of these processes are so complex, yet they are based of reduction-oxidation reactions. A reduction-axidation reaction, or redox reaction, is the reaction where one molecule is reduced by gaining an electron, and the ones that are oxidized lose the electron. Now this part is a little confusing, the reducer is loses the electron to the oxidizer who gains it, therefore the reducer is oxidized and the oxidizer is reduced. Anyways back to cellular respiration; during the electron transport chain the primary electron acceptor is reduced by NaDH, and then oxidized by the secondary electron acceptor. The secondary electron acceptor is reduced by the primary and oxidized by the tertiary. The tertiary is reduced by the secondary, and oxidized by oxygen, the ultimate oxidizer. This in the meantime has caused the electron acceptors to pump spare hydrogen ions, which are then converted back into ATP, by ATP synthase. So you see without redox reactions, we would not be able to exist because we would be without energy.