Dr. Manishika Jain explains NCERT Class 9 Science Chapter 5: Fundamental Unit of Life
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Non (ribosome), Single (vacuole) and double (Mitochondria) membraned organelles
Osmosis & plasmolysis
Only cell organelle seen in prokaryotic cell is ribosomes
Why is lysosome called suicidal bag
Soap solution – hypertonic (water moves out by osmosis)
Bacteria do not have chloroplast but some bacteria are photoautorophic in nature and perform photosynthesis - Small vesicles associated with plasma membrane
If Golgi apparatus is removed – vesicle formation stops
Robert Hooke saw that the cork resembled the structure of a honeycomb consisting of many little compartments. Cork is a substance which comes from the bark of a tree. This was in the year 1665 –
Cell from Latin word which means “Little Room”
Onion peel in safranin/iodine/methylene blue solution under compound microscope – honeycomb – cell with nucleus (also cheek cells by toothpick)
Leeuwenhoek (1674), with the improved microscope, discovered the free living cells in pond water for the first time.
It was Robert Brown in 1831 who discovered the nucleus in the cell.
Purkinje in 1839 coined the term ‘protoplasm’ for the fluid substance of the cell.
Schleiden (1838) and Schwann (1839) – cell theory
Virchow (1855) by suggesting that all cells arise from pre-existing cells. With the discovery of the electron microscope in 1940, it was possible to observe and understand the complex structure of
the cell and its various organelles
Unicellular organisms – Amoeba, Chlamydomonas, Paramoecium and bacteria
Every multi-cellular organism has come from a single cell. How? Cells divide to produce cells of their own kind. All cells thus come from pre-existing cells.
Brain Teasers @0:30
Cell Discovery @1:02
Cell & Organelles @4:48
Hypotonic Solution @7:31
Isotonic Solution @7:50
Hypertonic Solution @8:09
Cell Wall @10:02
Osmosis is a Classic Characteristic of a Living Cell @11:55
Nucleus @12:59
Cell Organelles @16:11
Storage Sac @24:10
Cell Division @25:25
#Osmosis #Cytoplasm #Hypotonic #Flattened #Multicellular #Microscope #Organelle #Prokaryotic #Teasers #Cytoplasm #Manishika #Examrace
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