Question

Outer most layer of plant cell envelope is :

Answer 1

The cell envelope consists of a tightly bound three-layered structure i.e., the outermost glycocalyx followed by the cell wall and then the plasma membrane. Although each layer of the envelope performs a distinct function, they act together as a single protective unit.

Glycocalyx differs in composition and thickness among different bacteria. It could be a loose sheath called the slime layer in some, while in others it may be thick and tough, called the capsule.

Cell wall is the outermost layer of the plant cell which is made up of cellulose and lignin. It helps in supporting the contents of the plant cells and protects the plant cell from wear and tear losses.

The plasma membrane is selectively permeable in nature and interacts with the outside world.
Hence, the correct answer is option “B” – Cell wall.