Iodine solution is used to test leaves for the presence of starch. You need to: heat a plant leaf in boiling water for 30 seconds (this stops its chemical reactions) heat it in boiling ethanol for a few minutes (this removes most of its colour)
Bubonic plague is a deadly infectious disease commonly spread by rats.
(<span>It follows infection by the bite of the chip of a rat or <span>rodent)</span></span>
