What are barophilic prokaryotes?

Which of the following may occur in arctic and alpine meadows?

Which of the following statements regarding cyanobacteria is incorrect?

In the five-kingdom classification of Whittaker,kingdom $Monera$ is the group of microorganisms. Among the following statements,find out the incorrect statement for bacteria.

Select the correct statements from the given statements $(1-4)$ regarding the characteristics of some organisms.
$(1)$ Methanogens are Archaebacteria that produce methane in marshy areas.
$(2)$ $Nostoc$ is a flagellated blue-green alga that fixes atmospheric nitrogen.
$(3)$ Chemosynthetic autotrophic bacteria synthesize cellulose from glucose.
$(4)$ Mycoplasma lacks a cell wall and can survive without oxygen.

Which kingdom is characterized by the presence of a rigid cell wall and nucleoprotein as genetic material?