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Paleontological Evidence

What is the b...

Question

What is the best reason for considering N. sylvestris and N. tobacum to be separate species?

A

They are physiologically distinct

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B

They are morphologically distinct

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C

They cannot interbreed in nature

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D

They are reproductively distinct

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Solution

The correct option is C They cannot interbreed in nature
Biological concept of species says only the members of a species can breed freely in nature to produce fertile offsprings. The plant tobacco (Nicotiana) has two different species, N. sylvestris and N. tobacum. These two species cannot reproduce freely.

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Q. 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 them to be separate species

Q. Nicotiana sylvestris flowers only during long days and N. tobacum 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.tobacum to be separate species?

Q. Nicotiana sylvestris flowers only during long days while Nicotiana tobacum 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 offsprings.
What is the best reason for considering N. sylvestris and N. tobacum to be separate species?

Q. Assertion :Species are groups of potentially interbreeding natural populations that are isolated from other such groups. Reason: Reproductive isolation brings about distinctive morphological characters.

Q. Assertion: Species are groups of potentially interbreeding natural populations which are isolated from other such groups.

Reason: Distinctive morphological characters are displayed due to reproductive isolation.

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