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Biodiversity

Edexcel AS-level BiologyTopic 11 of 1722 lessons

Revision notes for Biodiversity in Edexcel Biology B (8BI0). Every lesson in BrainCake comes with R.E.C.I.P.E. recall steps, a quick check and spaced reviews.

  1. BiodiversityBiodiversity is the variety of living organisms in an area.
  2. The Importance of BiodiversityBiodiversity matters for several connected reasons.
  3. Species RichnessSpecies richness is the number of different species present in a particular area or habitat.
  4. Endemic SpeciesAn endemic species is one that is found naturally in only one geographical location and nowhere else on Earth.
  5. Species AbundanceSpecies abundance is the number of individuals of each species in an area.
  6. Index of DiversityAn index of diversity is a single number that describes the biodiversity of a habitat, taking into account both the number of species (species…
  7. Biodiversity of Different HabitatsThe index of diversity lets biologists compare biodiversity between habitats in a fair, quantitative way.
  8. Changing BiodiversityBiodiversity is not fixed.
  9. Allele FrequencyGenetic diversity within a species depends on the variety of alleles in its gene pool.
  10. Measuring Genetic BiodiversityGenetic diversity is the variety of alleles within a species or population.
  11. HawaiiThe Hawaiian Islands are one of the best examples of how isolation creates biodiversity, and of how human activity can destroy it.
  12. Ethical Argument for BiodiversityPeople give many reasons for conserving biodiversity.
  13. Ecosystem ServicesEcosystem services are the benefits that people obtain from ecosystems.
  14. Conserving EcosystemsThe most effective way to protect biodiversity is usually to conserve whole ecosystems and habitats.
  15. ConservationConservation is the protection and careful management of species, habitats and ecosystems so that biodiversity is maintained for the future.
  16. Ex-Situ Conservation of PlantsEx situ conservation of plants means protecting plant species away from their natural habitat.
  17. Ex-situ Conservation of AnimalsEx situ conservation of animals takes place mainly in zoos, wildlife parks and aquaria.
  18. In-Situ ConservationIn situ conservation means protecting species in their natural habitat.
  19. In-situ Conservation StrategiesThere are many practical in situ conservation strategies.
  20. National ParksA national park is a large area of land that is legally protected for its landscape, wildlife and cultural value.
  21. Conflicts with ConservationConservation often conflicts with the needs and wishes of people.
  22. SustainabilitySustainable development is development that meets the needs of the present without compromising the ability of future generations to meet their own…

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