Write a short note on Mycoplasma.

Plant pathogenic bacteria are usually ..........

Which of the following is characterized by having a cell wall made of peptidoglycan?

The current classification of organisms is into three domains of life ($Bacteria$,$Archaea$,and $Eukarya$). Which of the following statements is true for $Archaea$?

Match the following columns:

Column-$I$	Column-$II$
$A$. Halophiles	$i$. Gram-negative bacteria
$B$. Thermoacidophiles	$ii$. Extremely salty areas
$C$. Spirochetes	$iii$. Responsible for methane production
$D$. Firmicutes	$iv$. Acidic and high temperature environments
	$v$. Gram-positive bacteria

Cyanobacteria and heterotrophic bacteria have been clubbed together in eubacteria of kingdom-Monera as per the 'five kingdom classification' even though the two are vastly different from each other. Is this grouping of the two types of taxa in the same kingdom justified? If so,why? Discuss the cellular composition of cyanobacteria and heterotrophic bacteria that make them introduced in eubacteria.