Test Corrections - Biomes, Energy Flow, & Eco Succession

In what way is a decomposing log in a forest a microhabitat?

• It supports a distinct population of organisms, but the forest houses the log itself.

• It provides camouflage for particular organisms to protect them from predators.

• It decomposes into organic matter that enriches the soil.

• It is a large community of organisms that occupy a major habitat.

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NGSS.MS-LS2-2

Based on the information in the chart, what is the best explanation for the different variety of organisms in the two microhabitats?

• The rotting log and grassy area are in different biomes.

• Conditions for survival are different in each location.

• The rotting log has predators while the grassy area does not.

• There is more space in the rotting log than in the grassy area.

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NGSS.MS-LS2-1

Which statement best describes the comparison of lake and ocean environments?

• The lake and ocean environments support the same organisms because they are both water and are made up of the same elements.

• The lake and ocean environments support different organisms because most freshwater organisms cannot live in saltwater.

• The lake and ocean environments support the same organisms, but they will look different because of the type of water.

• The lake and ocean environments support different organisms because ocean organisms are blocked by land from getting into lakes.

A good adaptation for living in a grassland would be —

• the ability to hibernate.

• the ability of plants to grow very high to reach the sunlight.

• thick, insulating fur.

• the ability of plants to regrow after prairie fires.

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NGSS.MS-LS4-4

Some desert animals are most active at dusk and dawn. This adaptation is MOST helpful for —

• preying on plant species.

• finding new water sources.

• avoiding high temperatures.

• hiding from hungry animals.

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NGSS.MS-LS2-1

High biodiversity improves the sustainability of an ecosystem, because —

• It makes the food web simpler and ensures there are very few predators.

• Many organisms will undergo beneficial mutations and improve their traits.

• The ecosystem will continue to function even if some populations decrease.

• It allows organisms from different species to mate and create new species.

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The food webs below model relationships among the organisms in two ecosystems. 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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Students in a science class visited four local ecosystems. The students observed the species present in each ecosystem and recorded their observations in the table. Based on the observations of four local ecosystems recorded in the table, which ecosystem is likely to be the least sustainable and why?

• Ecosystem 1 - it has the fewest species

• Ecosystem 2 - it supports many animals

• Ecosystem 3 - it has few predators

• Ecosystem 4 - it includes both aquatic and terrestrial species

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Two of the greatest threats to biodiversity and the sustainability of ecosystems are - [Select TWO choices]

• Changing of natural habitat for farming, mining, and urban development

• Diseases that spread from humans to animals

• Lack of recycling programs and excess food waste

• Catching fish or hunting animals at a rate that doesn't allow populations to rebuild

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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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NGSS.MS-LS2-5