Question

PPLO is the smallest cell in the living world. The extended form of PPLO is
(A) Pseudo Pneumonia Length Orge
(B) Pseudo Plank Leg Organelle
(C) Pneumonia Plank Like Organism
(D) Pleuropneumonia Like Organism

Answer 1

Hint: PPLO belongs to the genus of bacteria and has similar characteristics to them but it lacks the cell wall surrounding the cell organelles. They were first found out by Pasteur in the year 1930 when he dealt with pleuropneumonia in the cattle.

Complete answer:
PPLO are the smallest free living prokaryotic organisms or the cells, its size ranges from $0.1\,mm$ to$0.3\,mm$. These organisms have the ability to live without the presence of oxygen also. Due to the absence of cell walls, they are much more resistant to some antibiotics that target the growth and generation of cell walls than the other organisms. An example for this antibiotic is penicillin. These are pathogenic and are responsible for causing atypical pneumonia in the human beings and some animals. They cause the infections in the tracheal cavity of the humans. At first these are referred to as filterable viruses, because they pass through the filter and remove bacteria. These pleuropneumonia like organisms are also known as mycoplasma. The extended form of PPLO is Pleuropneumonia Like organisms.

Thus, the option (D) is correct.

Note:The scientist, Eaton found the drug to kill these PPLO and to cure pneumonia. He found the drug Aureomycin to which these mycoplasmas are sensitive. And hence Pleuropneumonia Like organisms are also called Eaton's agent.