A strawberry isn't an actual berry, but a banana is
By definition, a berry is a fleshy fruit produced from a single seed. The strawberry, however has its dry, yellow "seeds" on the outside (each of which is actually considered a separate fruit). True berries, such as blueberries and cranberries have seeds inside. However, the banana fruit is a berry for the same reason strawberries are not.
Strawberries are an example of an “aggregate fruit”, forming from a flower that has many ovaries; the ovary being the part of the flower that eventually develops and ripens into a fruit. Once the ovaries are pollinated, the ovaries will swell and eventually form the strawberry as we think of it.
As noted, strawberries form from a flower that has many ovaries. This makes them a complex fruit, much like blackberries or raspberries. Actual berries, though, are what are known as “simple fruits”, meaning they form from a flower that has only one ovary, such as grapes.
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