Which type of nutrition is observed in the multicellular producer kingdom?

The division $Tracheophyta$ includes which of the following?

August Wilhelm Eichler proposed a system of classification for the plant kingdom in $1883$. Into how many sub-kingdoms did he divide the plant kingdom?

Which kingdom is characterized by the presence of a rigid cell wall and the formation of an embryo?

What are plants without seeds called?

Which type of classification system was proposed by $Bentham$ and $Hooker$?