THE INVISIBLE LIVING WORLD –
PREMIUM EXAM NOTES
CORE IDEA (Most Important Line)
There exists a hidden world of microscopic living organisms which became visible only
after the invention of lenses and microscopes.
1. WHY WE CANNOT SEE EVERYTHING
Human eye has limited resolving power. Objects below a certain size are invisible. The
discovery of the lens changed observation.
Lens = curved glass that magnifies objects.
2. DISCOVERY OF MICROSCOPIC WORLD
Robert Hooke
Year: 1665
Observation: Observed cork and saw small compartments.
Naming: Named them cells.
Publication: Book: Micrographia
,Antonie van Leeuwenhoek
Contribution: First to see living microorganisms.
Observations: Observed bacteria, blood cells.
Title: Called Father of Microbiology.
, 3. CELL – BASIC UNIT OF LIFE (VERY IMPORTANT)
All living organisms are made of cells.
Basic Parts:
Cell membrane: Controls entry/exit.
Cytoplasm: Site of life processes.
Nucleus: Controls activities.
PREMIUM EXAM NOTES
CORE IDEA (Most Important Line)
There exists a hidden world of microscopic living organisms which became visible only
after the invention of lenses and microscopes.
1. WHY WE CANNOT SEE EVERYTHING
Human eye has limited resolving power. Objects below a certain size are invisible. The
discovery of the lens changed observation.
Lens = curved glass that magnifies objects.
2. DISCOVERY OF MICROSCOPIC WORLD
Robert Hooke
Year: 1665
Observation: Observed cork and saw small compartments.
Naming: Named them cells.
Publication: Book: Micrographia
,Antonie van Leeuwenhoek
Contribution: First to see living microorganisms.
Observations: Observed bacteria, blood cells.
Title: Called Father of Microbiology.
, 3. CELL – BASIC UNIT OF LIFE (VERY IMPORTANT)
All living organisms are made of cells.
Basic Parts:
Cell membrane: Controls entry/exit.
Cytoplasm: Site of life processes.
Nucleus: Controls activities.
