At what level is the scientific name of any organism the same?

Which of the following is false regarding a species?

Binomial nomenclature was introduced by

The scientific name of Mahua is ......... .

What is the name of the book written by Aristotle?

$Nicotiana \ sylvestris$ flowers only during long days and $N. \ tabacum$ flowers only during short days. If raised in the laboratory under different photoperiods,they can be induced to flower at the same time and can be cross-fertilized to produce self-fertile offspring. What is the best reason for considering $N. \ sylvestris$ and $N. \ tabacum$ to be separate species?