$ICZN$ stands for the naming of:

Most of the botanical names are derived from which of the following languages?

$Nicotiana$ $sylvestris$ 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?

Linnaeus classified plants into $24$ groups based on which of the following?

Which of the following represents the contribution of Julian Huxley to the field of biology?

Which of the following is essential for the study and identification of living organisms?