Fundamental Unit Of Life Class 9 Notes CBSE Science Chapter 5

CBSE NCERT Class 9 Notes Science contains physics, chemistry and biology notes of chapter 5 Fundamental Unit Of Life topics given in textbook are part of Revision Notes for Class 

Science Notes cover an overview of the main given points of every concepts and Topics in the NCERT TextBooks Class 9th Science this Chapter Notes includes topic/concepts wise explanations for all the topic provided in the book such as Cell Wall and Cell Membrane, Nucleus , Cytoplasm and Cell Organelle

Well prepared Class 9th Science all Chapters Notes will guidance students understand the topics ,concepts and themes covered in all the chapters of Ncert Text book of 9th 

The Fundamental Unit of Life – Cell 

Cell

 The word cell is derived from the Latin word ‘cellula’ which 

means a little room.

 Human body is composed of more than 200 different kinds 

of cells, each specialized for distinctive functions as 

memory, sight, movement and digestion. 

 A cell is the structural and functional unit of life.

 Cell is the building block of which all living organisms are made.

 It is the smallest unit of life capable of all the living functions.

Discovery of Cell

 In 1665, Robert Hooke saw the cork resembled the structure of honey comb consisting of 

many little compartments.

 Cork is obtained from the bark of a tree.

 Nerve cells carry message

 Hooke observed cork’s honeycombed or porous structure.

 Hooke found porous structure of cork to resemble with monasteries 

and called the units, cells.

 He published his work in a book ‘Micrographia’ in 1665.

Robert Hooke’s Microscope

Dead Cork cells by Robert Hooke

Anton Von Leeuwenhoek

 He made an improved microscope.

 He discovered sperm cells of humans, dogs, rabbits, frogs, 

fish & insects.

Cell Theory

 In 1838, Jacob Matthias Schleiden, a German botanist proposed the idea that all plants 

consist of cells.

 In 1839, Theodor Schwann, a German zoologist, proposed the idea that all animals consist of cells .

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