Question

Why tomato was declared vegetable as it is a fruit????

Answer 1

pNix v. Hedden, 149 U.S. 304, was a decision by the Supreme Court of the United States that, under U.S. customs regulations, the tomato should be classified as a vegetable rather than a fruit.

Answer 2

Scientifically speaking, a tomato is definitely a fruit. True fruits are developed from the ovary in the base of the flower, and contain the seeds of the plant (though cultivated forms may be seedless). Blueberries, raspberries, and oranges are true fruits, and so are many kinds of nut.