Botanically speaking, the banana plant is not a tree but the world's largest perennial herb. The 'trunk' is actually a pseudostem made of tightly wrapped leaf bases. Furthermore, the banana fruit itself is classified as a berry, while the strawberry is not. Most bananas sold in the West are the Cavendish variety, which are clones of one another, making them highly susceptible to diseases like Panama Disease. Bananas are slightly radioactive because they contain high levels of Potassium-40; however, you would need to eat roughly 700 bananas a day for 80 years to receive a lethal dose of radiation. The characteristic curve of a banana is the result of 'negative geotropism,' where the fruit grows upward toward the sun rather than downward toward the ground.