Class 9 Chapter Cell fundamental unit of life Hand made Notes
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Course
20150
Institution
"The cell, as discussed in Class 9 Biology, is the fundamental unit of life. It's the basic structural and functional unit of all living organisms. Cells vary in size, shape, and function, but they all share common features like a cell membrane, cytoplasm, and genetic material. Understanding cells ...
class 9 chapter cell fundamental unit of life hand
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Fundamental Unit Of
Chapter-5
Life: Cell
cONCEPT MAPPING
Type of Organism
Unicellular Multicellular
One Many celled, e.g. man, caw, dog.
cell. e8. amocba,
paramecium, bacteria insects, plant, fungi
Okaryotic Cell
Cell pe of Cell Plant Eukaryotic Cell
LEukaryotic eLAnimal
Eukaryotic cell
Components of Cell
Cell wall C e l l membrane/ Cyloplasm
(ln plants) Plasma Mambrane
(Both plants &
animals) Cell Organelle
Nucleond Nucleu
(in Prokaryoles) finEukaryotes)
Endoplasmie Lysosomes Vacuoles Centrioless
Reticulum
Mitochondria Plastids (Only In plants)
Golgi apparatus
Rough Smooth
ER ER
Chromoplast Leucoplast Chloroplast
, Cauar djotm Nucleus
ube
CD Pme adjustment
Ar
Cells
Cotiito
MMIn
Fig. 5.1: Compound microscope Fig.: Onion Peel Cells
All living forms are composed of microscopic units called as 'Cells'.
Acellis the basic structural and functional unit of all ife forms.
Studyofstructureand compositionofcellis called as Cytology'.
Cell was first discovered and observed by Robert Hooke in a thin dead slice
ofcork in the year 1665.
First free living cell was discovered by A. V. Lecuwenhoek. in 1674.
Protoplasm is an aggregate of various chemicals such as water, ions, salts
and other organic molecules like proteins, carbohydrates, fats, nucleic
acids, vitamins etc. along with cell organelle & nucleus.
Its consistency differs under different condition, Its exists in sol-gel states.
Cell Theory :
Two biologists, Schleiden and Schwann (1838) gave the Cell theory which states that:
) All plants and animals are composed ofcells.
i) Cell is the basic unit of life.
(ii) All cell arise from pre-existing cells.
Viruses are the exceptions ofcell theory.
, Dt.
Pg. 2
CELL
Cell theoa
lwo biologists, Schleiden and Schuaan1838) 9aue -be Cell_
theor which states hat 2
ALPlanis and animals axe comPosed o cells
Cell is the bas unii a Life
[iRR)_ All cell_ariseaom pre- exislig cells.
Vízuses_are dhe exteptions ocelltheorHey have ro_cells
ProKaryotíc Cell
TYPES Of CELLS Stngie telled
Eukaxythc Cell
LMulcelled
ProKotionic Cells Eukarlnic Cells
Very minute in sizel1-l6n) Faivlylarqe în Size (5-100um)
Aluats unicellular Hay be unicelkular
or mullicellula
Nucleolus absent Nucleolus Paegent
Single caomoscme paæsent Moxe Hhan one chomesome Present
Cx: Bacteria x: AL plart and Animay
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