Question

explain cell wall or plasma membrane

Answer 1

Cell wall : 1) maintains shape of cell
2) protects cell from mechanical. injury and prevents their desication .
3) provides mechanical support against gravity.
4) permits the cell to with stand very dilute external media without bursting.
plasma membrane : 1) forms outer covering of each cell .
2) present on both plant and animal cell
3) it is a living, thin delicate, elastic, selective permeable membrane.
4) main function is to regulate the movement of molecules inside and outside the cell

Answer 2

Hello!!

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Cell Wall:

➡️ The cells of bacteria, fungi algae and plants have an additional non-living rigid structure called the "cell wall" that surrounds the plasma membrane.

Functions of Cell Wall:

➡️ It maintains shape of the cells.

➡️ it protects the cell from mechanical injury.

➡️ It wards off the attacks of pathogens like viruses , bacteria and fungi.

➡️ It allows the material to pass in and out of the cell.

➡️ It helps in cell-to-cell interaction and provides Barrier to undesirable macromolecules.

Cell Membrane:

➡️ Plasma membrane is an absolute requirement for all living organisms as it is responsible for the relationship of a cell with the outside world.

➡️ Cell membrane is composed of lipids that are arranged in a bilayer.

➡️ In human beings, the membrane of the erythrocytes has approximately 52% protein and 40% lipids.

Functions of Cell Membrane:

➡️ The fluid nature of the membrane is important from the point of view of functions like cell growth, formation of intercellular junctions, secretion, endocytosis, cell division etc.

➡️ Plasma membrane allows the transport of the molecules across it.

➡️ The membrane is selectively permeable to some molecules present on either side of it.

➡️ The passage of substances across cell membrane occurs by various methods such as passive transport and active transport.

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