Linnaeus is credited for the introduction of:

$Nicotiana$ $sylvestris$ 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?

Based on the complexity of body organization,how can plants be classified?

Phenetic classification of organisms is based on which of the following?

The zoological name of the ‘Lion-tailed macaque’ is

Systematics does not include$:-$