Which of the following is responsible for the production of methane?

Cyanobacteria do not possess

Consider the following four statements $(A-D)$ and select the option which includes all the correct ones only.
$(A)$ Archaebacteria differ from other bacteria in having a different cell wall structure.
$(B)$ Bacteria as a group show the most extensive metabolic diversity.
$(C)$ All Eubacteria have chlorophyll ' $a$' pigment similar to green plants.
$(D)$ Mycoplasma can survive without oxygen.

Which among the following is $not$ a prokaryote?

Which of the following is not found in $Eubacteria$?

The 'Witches' broom' of legumes is caused by a