What is a calyx on a fruit?

A calyx on a fruit refers to the outermost whorl of floral parts, typically consisting of sepals that protect the flower before it blooms. Once the flower develops into fruit, the calyx can remain attached and may contribute to the structure or appearance of the fruit. In some fruits, like strawberries, the calyx is prominent and can be seen as the green leafy part at the top. Its presence can vary in significance and visibility depending on the type of fruit.