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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 $N$. tobaccum to be separate species?
They are physiologically distinct
They are morphologically distinct
They cannot interbreed in nature
They are reproductively distinct
Solution
Biological concept of species says that only the members of a species can breed freely in nature to produce fertile offsprings. The plant tobacco (Nicotiana) has two different species, Nicotiana tobaccum and Nicotianasylvestris . These two species cannot reproduce freely.
