UV-B radiation from the sun can affect how well plants grow by impacting their photosynthesis process. It reduces the efficiency of Photosystem I and II, which are important for plant growth. This happens because UV-B leads to the production of harmful reactive oxygen species that affect these systems. When plants are shielded from UV-B, their photosystems work better, showing improved electron transport rates. Less UV-B exposure also triggers better electron flow in plants, which helps them grow. So, if plants receive less UV-B, they can grow better.