That is an odd explanation of why watermelon would be a vegetable. Biologically, it is a fruit, because it is the seed container. Likewise, cucumbers and gourds are also fruits, biologically. They are colloquially considered vegetables because they are not sweet, and due to tradition, neither of which applies to watermelon.
Of course, 'vegetable' doesn't have a biological meaning akin to fruit, so definitions are somewhat subjective.
And one could definitely say it's not an animal or mineral.
__________________
_________________
|...............| We live in the nick of times.
| Len 17, Wid 3 |
|_______________| [pics]
|