Question

Functions of plasma membrane................

Answer 1

• The plasma membrane, or the cell membrane, provides protection for a cell. It also provides a fixed environment inside the cell. And that membrane has several different functions. One is to transport nutrients into the cell and also to transport toxic substances out of the cell.

Answer 2

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Functions of plasma membrane:--

Shape:-

It provides definite shape to semi fluid contents of the cell.

Mechanical Barrier:-

It functions as a mechanical barrier that protects the internal contents of the cell.

Selective Permeability:-

Membrane determines substances, entry or exit from the cell.

Endocytosis:-

The flexibility of the membrane enables the cell to engulf food and other substances (foreign particles) from its external environment by endocytosis. Amoeba acquires its food by this

The flexibility of the membrane enables the cell to engulf food and other substances (foreign particles) from its external environment by endocytosis. Amoeba acquires its food by this process.

Recognition:-

It has substances over its surface which function as recognition centres and points of attachment.They help in Tissue formation, distinction of foreign substances and defence against microbes.

Flow of information:-

It provides for flow of information amongst different cells of the same organism.

Osmosis:-

It occurs due to presence of tiny water channels in the plasma membrane.

Cell continuity:-

At places plasma membranes of adjacent cells become continuous to form plasmodesmata and cell junctions.

Specialization:-

Plasma membrane gets modified to perform different functions.

eg: absorption in microvilli.