$ICBN$ stands for

$A$ system of classification in which a large number of traits are considered is

Species that are morphologically similar but reproductively isolated are called ..........

$Nicotiana$ $sylvestris$ flowers only during long days,while $N.$ $tobacum$ 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?

Who defined species as a group of interbreeding organisms that are reproductively isolated from other such groups?

Phenetic classification is based on which of the following?