Question

Smallest cells so far known are:

• A. (a) Bacteria
• B. (b) Blue green algae
• C. (c) PPLOs
• D. (d) Human egg

Answer 1

The correct option is C

(c) PPLOs

The correct option is (c)

Explanation of the correct option

1. PPLO is also known as pleuro-pneumonia like organisms or Mycoplasma.
2. It is the smallest living organism known.
3. It is the causative organism of a disease called as Pneumonia in cattle.

Explanation of the incorrect option

Option (a) Bacteria are the organisms belonging to kingdom Monera and the smallest cell is a bacterium which is about 0.1 micron in size which is larger than the PPLO.

Option (b) Blue green algae is a type of cyanobacteria which occurs as long filaments and has a size larger than PPLO.

Option(d) Human egg has a larger size than PPLO.

Final answer

Smallest cells known are PPLOs.