The single cell performs all basic life activities like movement, intake of food, digestion, respiration, excretion, reproduction etc.

Each cell is specialized to perform different functions.They show the division of labour.

Division of labour has been made possible by specialization of cells and their grouping with each specialized clusters of cells in a definite place in the body.

For example, Blood, bone, cartilage are some examples of animal tissues while xylem, phloem, parenchyma etc.

Answers: 1- Cell, 2- Schwann and Schleiden, 3- Ostrich, 4- WBC, 5- Nucleus, 6- Mitochondria, 7- Plant, 8- Chloroplast, 9- Cell wall, 10- Unicellular True or false 1.

Chapter 4: Structure Of Atom Extra Questions-Answers Chapter: 4.

CBSE NCERT Class 9 Science Notes Chapter 5 The Fundamental Unit of Life will seemingly help them to revise the important concepts in less time.

He called boxes as cell which is Latin word for a little room.

This means that different parts of the body perform different functions.

For example, the stomach helps in digestion; blood is pumped by the heart, etc.

Diffusion helps in gaseous exchange between the cells as well as the cell and its external environment.

Such an undefined nuclear region containing only nucleic acids is called a nucleoid.

Cristae are folds which create a large surface area for ATP generating chemical reactions.

A large central vacuole may occupy 50-90 of the cell volume in some plant cells.

Diffusion: The movement of a substance from a region of its high concentration to the region of its low concentration is called diffusion.

Fundamental Unit Of Life Class 9