Biodiversity
- Created by: evaabarry
- Created on: 22-03-22 07:34
BIODIVERSITY
-> variety of ecosystems, habitats, species and genotypes that exist in an area.
-> The genetic variation within species.
-> variation un ecosystem/habitat.
->total number of species known & their relative abundance.
Ecosystem: interacting system of all the living and non-living things in a defined area.
Niche: the role of a species in an ecosystem.
Species: group of organisms with similar charateristics that can potentially interbreed & produce fertile offspring.
Habitat: particular location & type of natural environment occupied by a population.
Population: number of individuals of the same species that live in a specific place, time & which share the same gene pool.
Community: all of the populations of all the different species living in a specific area at a specific time.
CLASSIFICATION
-> Classify organisms according to how closely they are related to one another by looking at their physiology, anatomy and biochemistry.
Taxonomic System = system used for classification.
- involves placing organisms in a series of taxonomic units that form a hierarchy.
Domain = largest unit
- 3 Domains : Archea , Bacteria & Eukarya
Autotrophic: Make own nutrients/ photosynthesise
Heterotrophic: Take nutrients by feeding on other organisms (mosly decaying matter)
EXTREMOPHILES - Extreme conditions.
Halophiles: Lives in extremely salty conditions - Bacteria
Alkalinophiles: Favour PH more than 7
Acidophiles: Favour PH lower than 7
Thermophiles: Heat loving conditions
Cryophiles: Cold loving conditions
TAXONOMIC HIERACRHY
EUKARYA DIVIDED INTO 4 KINGDOMS:
1) Kingdom Protocista
- Eukaryotic cells
- Mostly exist as single cells
- Some group of similar cells
2) Kingdom Fungi
- Eukaryotic cells surrounded by cell wall
- Cell wall not made of cellulose
- Never have chloroplasts
- Non- motile
3) Kingdom Plantae
- Plants
- Eukaryotic cells surrounded by cellulose cell walls
-Multicellular
- Feed by photosynthesis
- Non- motile
- Autrophic
-Nucleus contains chromosomes & DNA and bound with histone proteins.
- 80S ribosome (70S in mitochondria & chloroplast)
4) Kingdom Animalia
- Animals
- Eukaryotic cells with no cell walls
- Motile
- Heterotrophic
- Multi-Cellular
- Nucleus contain chromosomes & DNA bound with histone proteins
- 80S ribosomes (70S in mitochondria)
- Some cells have cilia (ciliated epithelium) &…
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