Fundamental Unit of Life – Plasma Membrane : Chapter 5: CBSE Class 9 Science

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Fundamental Unit of Life – Plasma Membrane: Chapter 5: CBSE Class 9 Science

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In this video, we learn about, cell, the fundamental unit of life, plasma membrane, transport through the plasma membrane, animal cell, plant cell, diffusion, and osmosis.

Chapter Overview:
Fundamental unit of life, cell theory, types of cells, prokaryotic cell, eukaryotic cell, plant cell, animal cell, cell structure, plasma membrane, cell wall, protoplasm, Golgi bodies, ribosomes, mitochondria, centrioles, plastids, lysosomes, vacuoles, endoplasmic reticulum, nucleus, transport through plasma membrane, diffusion, osmosis, important points of cell.

Letโ€™s start with what is Cell?


The body of all organisms is made up of very small units called cell.
Cells are a fundamental unit of life.

The cell is capable of independent existence and can carry out all the functions which are necessary for a living being. Unicellular organisms are capable of independent existence which shows a cellโ€™s capability to existing independently unit of living organisms and the basic unit of life.

Cell structures
The cell is composed of some basic structures.

Plasma Membrane
The plasma membrane is the covering of the cell that separates the contents of the cell from its external environment.
It is a living part of the cell. It is very thin, delicate, elastic and selectively permeable membrane. The plasma membrane is composed of lipid and protein.

As it is a selectively permeable membrane, it allows the flow of limited substances in and out of the cell.

Transport of substances through the plasma membrane
The substance can pass through the plasma membrane by two processes:

1) Diffusion
2) Osmosis

It is the process in which a solid, liquid or gas moves from a region of high concentration to region of low concentration.

Osmosis is the movement of water from high concentration to low concentration through the semipermeable membrane.

All the above-mentioned topics are described in an interactive and efficient manner so that the students could easily understand them.

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