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NEET Biology NEET PYQ-Growth and Development Plants

  • question_answer
    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 crossfertilized to produce s elf-fertile offspring. What is die best reason for considering N. sylvestris and N. tabacum to be separate species?  [AIPMT 2003]

    A) They are physiologically distinct

    B) They are morphologically distinct

    C) They cannot interbreed in nature

    D) They are reproductively distinct

    Correct Answer: D

    Solution :

    [D] Biological concept of species says that only the members of a species can breed freely in nature to produce fertile offsprings. The plant tobacco (Nicociana) has two different species, Nicotiana tobaccum and Nicotiana sylvestris. These two species cannot reproduce freely.


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