Which of the following domains lacks a cell wall?

The natural system of classification is based on:

Which of the following kingdoms consists of multicellular consumers?

How many organisms in the list given below show autotrophic nutrition method?
$Lactobacillus, Nostoc, Chara, Wolffia, Nitrosomonas, Nitrobacter, Porphyra, Streptococcus, Saccharomyces, Trypanosoma$

Definitions / Explanation :
$(i)$ Autotrophic Nutrition
$(ii)$ Parasitic Nutrition

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

Column $X$	Column $Y$
$(1)$ Unicellular bacteria	$(P)$ Chlamydomonas
$(2)$ Unicellular algae	$(Q)$ Yeast
$(3)$ Unicellular fungi	$(R)$ Euglena
$(4)$ Unicellular protozoa	$(S)$ Bacillus