Question
Nicotiana sylvestris flowers only during long days while N.tabacum flowers only during short days. Under different photoperiods, they can be induced to flower at the same time and can be cross-fertilized to produce self-fertile offsprings. What is the best reason for considering Nicotiana sylvestris and N.tabacum as separate species?
Options :
They are reproductively distinct
They are physiologically different
They fail to interbreed in nature
They are distinct morphologically
Answer :
They fail to interbreed in nature
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