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Chapter 3-3 Science
6th Grade Study Cards
| Term | Definition |
|---|---|
| biodiversity | The number of different species in an area |
| genes | The structures in an organism's cells that carry its hereditary information. |
| size, appearance, disease | Genes determine an organism's characteristics, from its ________ and ___________ to its ability to fight __________. |
| economic value, ecological value | Biodiversity has both _________ __________ and ____________ ________ within an ecosystem. |
| Insects----950,000 | Look at Figure 7 on p. 95 Which group or organisms has the greatest number of species? |
| beauty, recreation | The simplest reason to preserve biodiversity is that wild organisms and ecosystems are a source of _______ and __________. |
| Economic value of biodiversity | Many plants, animals, and other organisms are economically valuable for humans. In addition to providing people with food, these organisms supply raw material for clothing, medicine, and other products. |
| keystone species | A species that influences the survival of many other species in an ecosystem. |
| ecosystem tourism or ecotourism | An important source of jobs and money for such nations as Brazil, Costa Rica, and Kenya. Many companies now run wildlife tours in rain forests, savannas, mountain ranges and other locations. |
| The sea urchins reproduced uncontrollably and ate almost all of the kelp. | What happened to the ecosystem when in the 1800s, hunters killed most of the sea otters on the Pacific Coast for their fur? |
| area; climate; niche diversity | Factors that affect biodiversity include: _____; ______; and ____ _____________. |
| area | The larger the ______ the more species that will be found in the area. |
| increases | In general, the number of species ________ from the oles toward the equator. |
| 7%; half | Tropical rain forest cover only ______ of the Earth's land surface but contain more than ______ of the world's species. |
| Climate is most responsible | Which factor is most likely responsible for the biodiversity of the tropical rain forests? |
| 1; 20; niche diversity | Coral reefs make up less than ___ percent of the ocean's area. But reefs are home to ___ percent of the worlds saltwater fish species. This is due to ____ _____________. |
| diverse gene pool; adapt | Species that lack a ________ ______ ______ are less able to _____ to changes in the environment. |
| extinction | The disappearance of all members of a species from Earth. |
| endangered species | Species in danger of becoming extinct in the near future. |
| threatened species | Species that could become endangered in the near future. |
| It has increase dramatically | How has the number of species becoming extinct changed in the last few centuries? |
| Panda bear, grizzly bear, bald eagle, Schaus Swallowtail butterfly, the whooping crane, and Steller's Sea Lion | List some endangered species |
| habitat destruction; poaching; pollution; exotic species | List some human activities that can threaten biodiversity and lead to extinction of a species. |
| habitat destruction | The loss of a natural habitat is the major cause of extinction. |
| --forests are cleared to build towns --plowing grasslands --filling in wetlands | List examples of habitat destruction: |
| habitat fragmentation | Breaking larger habitats into smaller, isolated pieces, or fragments. |
| mammals | Habitat fragmentation is very harmful to large ______ because they need large areas of land to find enough food to survive. |
| poaching | The illegal killing or removal of wildlife from their habitats. |
| skin; fur; teeth; horns; or claws. | Many endangered animals are hunted for their ____, ___, _____, ______, or _____. |
| These laws exist so the endangered species can survive and will not become extinct possibly harming an ecosystem. | Why are there laws against removing endangered species from their habitat. |
| pollution, pollution, pollutants | Some species are endangered because of ________. Substances that cause __________, called pollutants, may reach animals through the water they drink or the air they breathe. ________ may kill or weaken organisms or cause birth defects. |
| captive breeding, laws and treaties, and habitat preservation. | Three successful approaches to protecting biodiversity are ____ ____________, _______ ___ ______, and _______ ____________. |
| captive breeding | The mating of animals in zoos or wildlife preserves |
| laws and treaties | _______________________ can help protect individual species. Ex: Laws against selling products made from endangered species have helped protect ocelots. |
| habitat preservation | The most effective way to preserve biodiversity is ________ ____________. |
| 1872; Yellowstone National Park; 7,000 | Beginning in ________ with ______________ ____________ ____, the world's first national park, many countries have set aside wildlife habitats as parks and refuges. Today, there are about ____ nature parks, preserves, and refuges in the world. |
Created by:
dsimmons
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