Which kingdom was introduced in the four-kingdom classification,and who proposed it?

Select the correct match for $X$ and $Y$:

Column $X$	Column $Y$
$(1)$ Thermoacidophiles	$(P)$ Chitinous cell wall
$(2)$ Protista	$(Q)$ Gram-positive bacteria
$(3)$ Morel (Fungi)	$(R)$ Hot springs
$(4)$ Firmicutes	$(S)$ Slime molds

Most of the unicellular organisms are kept under

Out of the four statements $(1-4)$ given below,two are correct regarding Whittaker's classification system. Which two are correct?
$(1)$ Classification based on cell complexity
$(2)$ Classification based on mode of nutrition
$(3)$ Classification based on phylogenetic relationships
$(4)$ Classification based on habitat type

Which domain of the three-domain system includes the Kingdom Monera of the five-kingdom classification system?

In what respects do algae and fungi differ?