Binomial nomenclature means

The common name of pea is simpler than its botanical (scientific) name $Pisum$ $sativum$. Why then is the simpler common name not used instead of the complex scientific/botanical name in biology?

Provide the definitions/explanations for the following terms:
$(i)$ Scientific name
$(ii)$ Biodiversity

Which of the following terms is related to $Homo$ $sapiens$?

$Nicotiana$ $sylvestris$ 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 proposed the Binomial Nomenclature System?