Question

Who am I ?
I am single layered But maintain cellular osmotic pressure.

Answer 1

Hint: It is the structural and functional unit of all living organisms. It gives rigidity, strength, and protection against mechanical stress. It is only seen in plant cells, fungi, protists and most bacteria. Its components vary from species to species. It is more permeable to small molecules and it lacks surface cell receptors.

Complete answer:
To answer this question you must know about cell walls.
As we know, a cell is the structural and functional unit of life. We have studied that there are two types of cell : plant cell and animal cell. plant cells have a single protective layer known as cell wall whereas animal cells do not have cell wall For protection.
Cell walled is the rigid and protective covering commonly found in eukaryotes and prokaryotes. It is a non- living structure that varies in color and composition depending upon the type of an organism and is freely permeable to natural substances.

Main Function of the cell wall includes : shape maintenance, support and protection against viruses and other pathogens that may cause disease. When water moves inside the cell by the process called osmosis. so that osmotic pressure develops inside the cell. If the cell has a cell wall then it helps to maintain the cell water balance.
As per the above paragraphs it is clear that the cell wall is a single layer and it helps to maintain the osmotic pressure therefore the correct answer of the given question is the cell wall.

Note:-
The cell wall was discovered by Robert Hooke in 1665, while its name comes from the Latin word cella meaning a small room. Cell wall is made up of cellulose and mature cell walls add substances to the primary cell wall for additional strength. The fibres of the cell wall laids down in different directions to add strength. Cell walls work with the vacuole to make a cell turgid and to support the plant.