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Terms in this set (25)
What is biodiversity
The number of different species in an area
Biodiversity is affected by
climate, niche diversity, area
Why is area important?
Large areas contain more species than small areas
What is the most diverse ecosystem?
Tropical rain forests
What is the second most diverse ecosystem?
What is niche diversity?
When different species live in different parts of the same ecosystem
True or false: Biodiversity has no economic value
What is a keystone species?
A species that influences the survival of many other species in an ecosystem.
True or false: If a keystone species disappears the entire ecosystem may change.
What are genes?
Structures in an organisms cell that carrys it hereditary information
What is a gene pool?
The individual differences of genes among members of the same species make up the total gene pool.
What are the advantages of a diverse gene pool?
The are better able to resist parasites, tolerate fungus attacks and drought
Name three true statements about extinction.
1.It is a natural process
2.Many species are now extinct
3.The number of species becoming extinct has increased dramatically
What is extinction?
Species has disappeared from Earth.
What is an endangered species?
The species could become extinct in the near future
What is a threatened species?
The species could become endangered in the near future
Name four natural events that might cause extinction
earthquakes, volcanos, landslides, or floods
The major cause of extinction is
What is habitat destruction?
Loss of a natural habitat
What is habitat fragmentation?
Breaking larger habitats into smaller, isolated pieces
What is poaching?
Illegally killing or removing wildlife species
What is captive breeding?
The mating of animals in zoos or wildlife preserves to protect severely endangered species
True or false: Laws cannot help protect individual species
The most effective way to preserve biodiversity is...
to protect many species
Pollutants affect organisms by
contaminating their drinking water, or absorbed into the plants they eat and killing or weakening the organism.