Question

The smallest and largest cell to be found till now is…………………..

Answer 1

Hint: Cells are the basic structural and functional unit for every organism and the complete body for a unicellular organism. The cells seen in different organisms greatly vary in size and shape.

Complete answer:
The smallest cell to be found till now is Mycoplasma galliceptium which is about 10micrometer in size. These are Bacterial cells without a cell wall and are found as saprophytes and pathogens to humans.
On the other hand, the biggest cell known is the egg of an ostrich. It’s almost 15-18 centimeter long and wide.
Mycoplasma is a bacteria from the family mycoplasmataceae of phylum tenericutes. These are immune to antibiotics that target cell walls as they don’t possess a cell around their cell membrane. Some of them are found as pathogens to humans such as M. pneumonia that causes pneumonia in humans. As they are the simplest and smallest organism on Earth, they are also known as mollicutes.
The egg of an ostrich is the largest cell to be found on Earth as well as the largest egg of a bird. These are not commonly eaten by man but humans use the shell for decorative artwork and as a container. On average these eggs are 15cm long, 13cm wide, and 1.4kg in weight. The weight is over 20 times that of a chicken's egg.

Note:
Sometimes the question may be limited to the largest and smallest cell in the human body. In that case, the smallest cell in humans is the cerebellum's Granule cell which lies between 4-4.5 micrometer in length. Sometimes the sperm is also considered to be the smallest as it measures about 4 micrometers in length. The largest cell in the human body is considered to be the ovum.