MICRO LESSON 1
Discovery of Cell
Picture it:
Robert Hooke saw tiny compartments in cork.
Simple:
Hooke named the structures cells.
Example:
Cork under microscope.
Remember:
Hooke named cells.
Quick Check:
What did Hooke observe?
MICRO LESSON 2
Cell Theory
Picture it:
All organisms are made of cells.
Simple:
The cell is the basic structural and functional unit of life.
Example:
Amoeba is one cell; humans many.
Remember:
Life begins at cell level.
Quick Check:
Can one cell be an organism?
MICRO LESSON 3
Plasma Membrane
Picture it:
A cell controls what enters and leaves.
Simple:
The membrane is selectively permeable.
Example:
It allows some substances through.
Remember:
Membrane is gatekeeper.
Quick Check:
Why selectively permeable?
MICRO LESSON 4
Diffusion and Osmosis
Picture it:
Particles and water move according to concentration.
Simple:
Diffusion is high to low concentration; osmosis is water through a selective membrane.
Example:
Raisins swell in water.
Remember:
Osmosis is water movement.
Quick Check:
Why does a cell shrink in salt solution?
MICRO LESSON 5
Cell Wall
Picture it:
Plant cells need extra support.
Simple:
The cellulose cell wall gives shape and protection.
Example:
It prevents bursting in hypotonic solution.
Remember:
Wall = plant support.
Quick Check:
Do animal cells have it?
MICRO LESSON 6
Nucleus
Picture it:
Cells need a control centre and genetic instructions.
Simple:
The nucleus controls activity and contains chromosomes.
Example:
Genes are on chromosomes.
Remember:
Nucleus = control centre.
Quick Check:
Where are genes?
MICRO LESSON 7
Mitochondria
Picture it:
Cells need usable energy.
Simple:
Mitochondria release energy and make ATP.
Example:
Active cells have many mitochondria.
Remember:
Powerhouse of cell.
Quick Check:
Why many in muscle cells?
MICRO LESSON 8
Endoplasmic Reticulum
Picture it:
Cells need an internal transport network.
Simple:
Rough ER has ribosomes; smooth ER helps make lipids.
Example:
RER supports protein synthesis.
Remember:
Rough means ribosomes.
Quick Check:
Which ER lacks ribosomes?
MICRO LESSON 9
Golgi and Lysosomes
Picture it:
Materials must be packed and wastes digested.
Simple:
Golgi modifies and packs; lysosomes digest.
Example:
Golgi is packaging centre.
Remember:
Golgi packs, lysosome digests.
Quick Check:
Why are lysosomes called suicide bags?
MICRO LESSON 10
Plastids and Vacuoles
Picture it:
Plant cells make food and store water.
Simple:
Chloroplasts contain chlorophyll; vacuoles store substances and maintain turgidity.
Example:
Large central vacuole in plant cells.
Remember:
Chloroplast makes, vacuole stores.
Quick Check:
Which organelle has chlorophyll?