The organism shown in the given figure belongs to which kingdom according to the Whittaker classification system?

Which are the most primitive types of organisms?

Pigment containing membranous extensions in some cyanobacteria are

Which of the following are concerned with eubacteria?
$(1)$ Methanogens $(2)$ Anabaena $(3)$ $N_2$ fixation $(4)$ Thermoacidophiles $(5)$ Eukaryotes $(6)$ Diatoms $(7)$ Gelatinous sheath $(8)$ Heterocyst

Which of the following are the smallest living cells,lack a cell wall,are pathogenic to both plants and animals,and can survive without oxygen?

Cyanobacteria is a