The answer to "Which fruit has no tree?" is watermelon, as it grows on vines on the ground.
While many fruits grow on trees, some, like watermelons, cantaloupes, and honeydew melons, develop on vines that spread across the ground. Grapes also grow on vines, though they tend to climb rather than stay grounded. The key distinction is the absence of a woody trunk or substantial branches characteristic of trees. Watermelons are a prime example of a fruit that grows without the support of a tree structure.
