Which of the kingdoms in Whittaker's classification include producers?

Which of the following is an example of a microorganism?

Which of the following are considered as the decomposers of the plant kingdom?

Select true statements from the followings $:-$
$(i)$ Aristotle used morphological characters to classify plants.
$(ii)$ Two kingdom classification was proposed by Linnaeus.
$(iii)$ Whittaker used Habitat information in his five kingdom classification.
$(iv)$ Archaebacteria can live under extreme conditions.

The sexual system of classification is:

Plant decomposers are