Cell structure and function presentation for about 6-8 class students . Some of basic idea about cell . Types of cell, diff. Between plant and animal cell. All things are explain in very easy way.

1. CELL
STRUCTURE AND FUNCTION
BY : SHIVANI SHARMA

2. CONTENT
WHAT IS CELL ?
CELL NUMBER, SHAPE AND SIZE
TYPES OF CELL
DIFFERENCE B/W PLANT AND
ANIMAL CELLS
LEVEL OF ORGANIZATION

3. WHAT IS CELL ?
• The cell is the smallest unit of life .
• Cell is the structural and functional unit of living organism.
HELLO, I’M
CELL

4. DISCOVERY OF CELL
• Robert Hooke was the first scientist to discover existence of cell with the help of
microscope in 1965.
• He observed thin slices of cork ( a part bark of a tree) under the microscope and saw the
honeycomb like structure.
• Hooke observed cell wall because cork cell is dead and without cytoplasmic contents.
• Anton van Leeuwenhoek was the first person who observed living cell under
microscope and named them animalcules (little animals).

5. CELL NUMBER
On the basis of no. of cell ,living organisms can be classified into two categories:-
1. Unicellular - Living organism consists of single cell.
Example: Amoeba, Euglena
2. Multicellular – Living organism consists of more than one cell.
Example: Earthworm, Human being
Amoeba Euglena Earthworm Human being

6. CELL SHAPE AND CELL SIZE
CELL SHAPE:
• The shape of cell differ not only in different organisms, but also in different organs of
some organism.
• Shape may be oval,spherical,cuboidal, fibre like or polygonal.
CELL SIZE:
• The difference in size of organism is due to the number of cells present in them.
• The smallest cell Pleuro Pneumonia like organism (PPLO) are called mycoplasma is
about 0.1 micron meter in diameter.
• The largest cell is Ostrich cell with 170mm in diameter.
• The longest cell in human body is Neuron.

7. CELL TYPES
On the basis of their nuclear organization, cell of two types:
 Prokaryotic: In Greek, {Pro: primitive ; karyon: nucleus.}
1. No nucleus
2. No membrane bound organelles like mitochondria or chloroplasts.
3. Very small 1-10 micro meter.
4. First type of cell on earth.
5. Cell division take place by budding and fission.
6. It contain single chromosome which is circular in shape.
Example: Bacteria and Blue green algae

8.  EUKARYOTIC: In Greek, { Eu: true ; karyon :nucleus.}
1. True nucleus.
2. Membrane bound organelles.
3. Cell size 10-100 micro meter.
4. It contain more than one chromosome.
5. Cell division take place by mitosis and meiosis.
Example: fungi , protists, plant and animal cells.

9. PARTS OF CELL
• Nucleus
• Nuclear membrane
• Plastid
• Cytoplasm
• Chloroplast (in plant cell)
• Mitochondria
• Endoplasmic reticulum (SER Or RER)
• Golgi body/golgi complex
• Vacuoles
• Ribosomes
• Lysosomes

10. Cell components/
Organelles
Plant cell Animal cell
Cell wall Present Absent
Cell membrane Present Present
Plastid Present Absent
size larger Comparatively smaller
vacuoles Large size and more in
number
Small size or absent
Mitochondria Present Present
Nucleus Present Present
chloroplast Present Absent
ribosome Present Present
DIFFERENCES B/W PLANT AND ANIMAL CELLS

11. LEVELS OF ORGANIZATION OF LIVING
BEING

12. THANK YOU