Full lecture notes based on ncert books Class 11. Full details are provided in this PDF.

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Class notes

Full lecture notes based on ncert books Class 11. Full details are provided in this PDF.

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This note provide you easy understanding of cell the unit of life chapter based on ncert books. Class 11 (botany)| chapter - 8

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CELL : THE UNIT OF LIF

By:-Raushan Kuma

, CELL : THE UNIT OF LIFE

What is Cell ?

• Cell is the structural and functional unit of an

organism.
Unicellular organism
• All organisms are composed of cells.

• Some are composed of a single cell and are

called unicellular organisms.

• While others composed of many cells, are

called multicellular organisms.
Multicellular organis

, CELL : THE UNIT OF LIFE
Minimum Requirement in a Cell

Cell Membrane
Cytoplasm Complete cell
(show independent existence

Genetic material

 Unicellular organisms are capable of :-
• Independent existence
• Performing the essential functions of life.
Unicellular organism

, CELL : THE UNIT OF LIFE
 Anything less than a complete structure of a cell does not ensure
independent living.

Bacteriophage (V
History of cell
 First cell discovered by :-
Robert Hooke in Cork cells (Dead cell)
 First living cell discovered by :-
Anton Von Leeuwenhoek (living cell)
 Nucleus discovered by :-
Robert Brown

Connected book

Dr. O. P. Saxena, , Dr. Sunita Bhagia, Megha Bansal CBSE/NCERT Biology Class - 11

Publisher: 2023 ISBN: 9783642688850 Edition: Unknown

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Uploaded on: May 18, 2025
Number of pages: 179
Written in: 2024/2025
Type: Class notes
Professor(s): Roushan kumar
Contains: All classes

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