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IB ESS Unit 3 Revision questions well answered to pass
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IB ESS Unit 3 Revision questions well answered to pass
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IB ESS Unit 3 RevisionBiodiversity - correct answer ✔✔broad concept of encompassing total diversity which includes genetic
diversity, species diversity and habitat diversity.
Genetic diversity - correct answer ✔✔Range of genetic material present in the population of a species
Species Diversity - correct answer ✔✔number of organisms within each different species
Habitat diversity - correct answer ✔✔range of different habitats within a biome
Habitat Diversity Advantages - correct answer ✔✔higher rate of resilience,
higher genetic diversity,
more nutrients in the soil for other plants to use
Habitat Diversity Disadvantages - correct answer ✔✔- Can be the result of fragmentation
- Some don't have a lot of plants
How do we measure biodiversity? - correct answer ✔✔- Measuring pollution, eutrophication,
colonization, patterns in biodiversity
- Quadrat sampling
- Simpson's Diversity Index
Hotspots - correct answer ✔✔region with a high level of biodiversity that is under threat from Human
Activities.
Endemic Species - correct answer ✔✔species that are only found in one geographic location
Aspects of a hotspot - correct answer ✔✔- 70% of the habitat has been lost already
, - Over 1,500 species of plants that are endemic
- Tend of large densities of human habitation nearby
- Cover 2.3% of the land surface
Examples of Hotspots - correct answer ✔✔Caribbean Islands, Cerrado
Evolution - correct answer ✔✔gradual change in the genetic characteristics of populations over many
generations achieved largely through the mechanism of natural selection
Genotype - correct answer ✔✔genetic makeup of an organism
Phenotype - correct answer ✔✔physical characteristics of an organism
Natural Selection - correct answer ✔✔those who are more adapted to the environment through genetic
variation have an advantage and flourish and reproduce.
Survival of the Fittest - correct answer ✔✔Those who are fit to suit an environment, survive and
reproduce
Adaptation - correct answer ✔✔Change in genetic structure or behavior in order for a species to survive
in their environment
Speciation - correct answer ✔✔formation of a new species
physical barriers - correct answer ✔✔physical separation of a species not allowing them to reproduce.
This can include mountains or a river.
Causes isolation -> speciation
Land bridges - correct answer ✔✔Lowered sea levels cause 2 geographic locations to conjoin.
- New species from the two recently conjoined areas can invade the new area. Some species may be able
to interbreed with the newfound species,
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