Semester Exam 7th Grade Science - Part B

A diagram of a prairie food web is provided.

A reduction in deer population will have the effect in the amount of energy this ecosystem is able to provide for which of the following organisms?

• mouse

• hawk

• rabbit

• mountain lion

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The ocean ecosystem has a high sustainability because of -

• green plants growing on the bottom.

• predator/prey relationships.

• the large variety of different organisms.

• strong, persistent currents.

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An example of a typical pioneer species, that is one that appears in the earliest stages of ecological succession, is –

• humans

• weeds

• oak trees

• spiders

The illustration provided shows a river and four cities on that river.

When the water from the river was sampled at location X, it was determined to be polluted with various chemicals. What would be the most likely source for this pollution?

• 1 and 2

• 2 and 3

• 3 and 4

• 1 and 4

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What factor contributes most to the sustainability of a habitat?

• Absence of bacterial species

• Large variety of organisms

• Competition among large predators

• Presence of volcanic rock

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Ecological succession takes place in an area where -

• large organisms outcompete smaller organisms.

• changes in the community's species composition occurs over time.

• an invasive species is artificially introduced.

• weeds grow in a garden next to vegetables.

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NGSS.MS-LS2-2

Plants that have deep roots, which extend, are able to reach cooler regions and absorb water that the roots of other plants can’t reach. These plants have leaves that are greatly reduced in size, modified in shape, or even completely lacking leaves. This adaptation is expected in a habitat with which of the following climatic conditions?

• Hot and Arid

• Cool and Sunny

• Cold and Dark.

• Wet and Cloudy

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NGSS.MS-LS1-5

The diagram illustrates the relationship of two species living in a grassland biome.

What conclusion can be drawn about the location of the two species in a food web?

• It would be inappropriate for species A and B to be placed in the same food web

• Species A and B occupy the same level of the food web

• Species A is located on a higher level of the food web

• Species B is located on a higher level of the food web

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Which of the following are not biotic or abiotic factors in an ecosystem?

• rocks and energy

• cultural components

• water and air

• plants and animals

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If you are asked to label the forces that affect the seedling in the image above, which pair of words and arrows are the most correct to enter into the boxes?

• ↑ stem, ↑ gravity

• ↓ gravity, ↑ root

• ↓ stem, ↑ root

• ↓ gravity, ↓ root