The scientific naming of plants began with the publication of which book by Linnaeus?

The statement,'Systematics is the study of the diversity of organisms and all their comparative and evolutionary relationships,' is attributed to:

$Nicotiana \ sylvestris$ 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 $N. \ tabacum$ to be separate species?

Agrostology is related to the study of

Which of the following scientists classified plants into groups based on their habitat?

The name $Rauwolfia$ was given by whom?