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?
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?
- A
They are physiologically distinct
- B
They are morphologically distinct
- C
They cannot interbreed in nature
- D
They are reproductively distinct
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- [AIPMT 1990]
In which one of the following combinations (a-d) of the number of the chromosomes is the present day hexaploid wheat correctly represented?
Combination
Monosomic
Haploid
Nullisomic
TrisomicZ
In which one of the following combinations (a-d) of the number of the chromosomes is the present day hexaploid wheat correctly represented?
| Combination | Monosomic | Haploid | Nullisomic | TrisomicZ |