Science: CellsScience: Cells

Cells - IntroductionCells - Introduction There are two types of cells: eukaryotic There are two types of cells: eukaryotic

and prokaryoticand prokaryotic. .

•Fungi

•Protists

•Plants

•Animal

•Archaea

•Bacteria

Eukaryotic cellsEukaryotic cells

Fungi: heterotrophic, reproduction by spore

Protists: autotrophic

Plants: photosynthesis, autotrophic

Animal: heterotrophic, sexual reproduction

Prokaryotic cellsProkaryotic cells

Archea: no nucleus, autotrophic and heterotrophicArchea: no nucleus, autotrophic and heterotrophic

Bacteria: heterotrophicBacteria: heterotrophic

Differences between Differences between prokaryotic cell and prokaryotic cell and

eukaryotic celleukaryotic cell

Animal cellsAnimal cells

A membrane around the cellA membrane around the cell Cytoplasm: chemical activities, Cytoplasm: chemical activities,

mitochondrionmitochondrion Nucleus: genetic code, control Nucleus: genetic code, control

centre fo the cellcentre fo the cell Mitochondrion: organellesMitochondrion: organelles

Plant cellsPlant cells The plant cells have some key features in The plant cells have some key features in

common with animal cells (Membrane, common with animal cells (Membrane, cytoplasm, nucleus, mitochondrion)cytoplasm, nucleus, mitochondrion)

Cell wall: strengthens the cellCell wall: strengthens the cell ChloroplastsChloroplasts :contain chlorophyll, for :contain chlorophyll, for

photosynthesisphotosynthesis Permanent vacuole: help cell, with sap Permanent vacuole: help cell, with sap

cellscells

Specialised cellsSpecialised cells

Leaf cell: absorbs light for photosynthesis

Root hair cell absorbs water and mineral ions

Sperm cell: reproduction male cell

Red blood cells: carry oxygen, with haemoglobin

Tissue, organ and system

Tissue: a group of cell

Organ: a group of tissue

System: a group of organ

Osmosis

Osmosis: chemical process, the water moves across a membrane, from a more concentated solution to less concetrated solution.

Diffusion

Diffusion: when the solute moves from regions of higher concentration to regions of lower concentration.