ABC Science

Which organisms in the food web shown above compete for the same food source in this environment?

• Grasshoppers and snakes

• Hawks and frogs

• Frogs and snakes

• Decomposers and grasses

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• F

• G

• H

• J

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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 these observations, which ecosystem is likely to be the least sustainable?

• Ecosystem 1, because it has the fewest species

• Ecosystem 2, because it includes both aquatic and terrestrial species

• Ecosystem 3, because it has few predators

• Ecosystem 4, because it supports many animals

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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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NGSS.MS-LS2-5

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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Three different species of plants that live in the desert are shown. Species Z can successfully share the same environment with the other plants shown because species Z absorbs water--

• found deep underground, and species X absorbs water near the soil surface

• found deep underground, and species X absorbs water found deep underground

• near the soil surface, and species Y absorbs water near the soil surface

• near the soil surface, and species Y absorbs water found deep underground

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NGSS.MS-LS2-1

What conclusion could you make based on the graph?

• Nitrogen is NOT a problem in the Gulf of Mexico

• Corn and soybeans are the only sources of Nitrogen pollution

• Most nitrogen pollution found in the Gulf comes from farming crops.

• Nitrogen that comes from the atmosphere is most harmful.

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The strangler fig is a vine that starts out as a seed in the tree canopy of the rain forest. It drops its roots down from the canopy to the forest floor.

By sprouting in the rain-forest canopy, the strangler fig seedling is exposed to more

• sunlight

• soil

• nutrients

• consumers

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NGSS.MS-LS1-5

Four students were asked to create a graph representing a typical predator–prey relationship. Which graph shows a situation in which the number of predators in a population depends on the number of prey?

• 
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• 
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The Prairies Region and the Cross Timbers are located in north-central Texas. The graph below shows information about eating habits of white-tailed deer in these regions. A Cross Timbers rancher is concerned about competition between the ranch animals and the deer. Based on the graph, which ranch animals compete for the most food with white-tailed deer?

• Cattle that eat grass and feed

• Goats that eat weeds and shrubs

• Turkeys that eat seeds and fruit

• Hogs that eat fruit, seeds, and feed

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NGSS.MS-LS2-1

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