7th Grade Unit 7 Test Review

An ecosystem that is not sustainable can break down when a natural disaster occurs.

This can lead to organisms in the ecosystem either leaving the area or dying off.

Increased biodiversity results in a more sustainable ecosystem because —

• a greater number of plant species means that there is less barren land

• a greater variety of species present allows more organisms to adapt after changes

  occur

• the transition area between two ecosystems is narrower

• there are fewer species to be affected by environmental stresses

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With many varieties of plant and animal species, the most productive biomes on Earth that have the greatest biodiversity are —

• deserts

• temperate grasslands

• steppes

• tropical rainforests

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The picture shows a group of wild rabbits living together near a village in Sydney, Australia.

Which level of organization does this group of rabbits best represent?

• A population

• A community

• An ecosystem

• An organism

The domains of living organisms are —

• Archaea, Euryarchaeota, and Eukarya, and they are the broadest level of taxonomic organization.

• Prokarya, Bryozoa, and Bacteria, and they are the lowest level of taxonomic organization.

• Flustrina, Archaea, and Bryozoa, and they are the second-lowest level of taxonomic organization.

• Archaea, Bacteria, and Eukarya, and they are the broadest level of taxonomic organization.

Weeds are plants that grow in areas where they are unwanted. Often they spread aggressively and damage garden plants by competing with them for sunlight, water, and nutrients. The growth of weeds is the first stage of ecological succession, which acts to —

• restructure a habitat and allow only the most hardy plants to survive.

• clear-cut a habitat and allow only the smallest plants to survive.

• bring water to a habitat and allow only the most water-loving plants to survive.

• drain water from a habitat and allow only the most fibrous plants to survive.

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The pictures below show a humpback whale, weighing a massive 140 million grams, and a pygmy shrew, weighing 4 grams.

Are these two vastly different organisms classified in the same domain or kingdom?

• They are classified into the same domain, but they are in different kingdoms.

• They are classified into different domains, but they are the same kingdom.

• They are classified into the same domain and same kingdom

• They are classified into different domains and kingdoms.

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The picture shows a group of tropical fish interacting with a living tube sponge.

Which level of organization does the interaction of the tropical fish with the living tube sponge best represent?

• A community

• An organism

• A population

• An ecosystem

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Which ecosystem would be more likely to survive if a disease killed the grasses?

• The forest ecosystem, because most of the animals can eat other organisms

• The grassland ecosystem, because several predators compete for food

• The forest ecosystem, because it has three top predators

• The grassland ecosystem, because it has many herbivores

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Tropical rain forests have the greatest biodiversity of any type of land ecosystem. How does biodiversity contribute to the sustainability of an ecosystem?

• The presence of more species with different adaptations makes it more likely that some organisms will survive an ecological disaster.

• Greater genetic variation within species makes it more likely that some individuals will survive a disease outbreak.

• The presence of a variety of herbivore species that can feed on a large number of different producer species helps ensure abundant prey for predators in the ecosystem.

• All of the above

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Which of the following is NOT a reason why scientists classify organisms?

• So that scientists all over the world can talk about organisms with a common language

• So that scientists can organize all the different types of organisms to study them better

• So that scientists can more easily identify new organisms that are discovered

• So that scientists can tell the order in which the organisms were discovered