Unit 6 Review

Which pair of scenarios correctly identifies examples or characteristics of primary and secondary succession?

• Primary succession occurs in an area where trees are abundant. Secondary succession occurs after a fire disrupts an ecosystem, and the ecosystem is overtaken by new species.

• Primary succession commonly includes lichens and mosses as pioneer species. Secondary succession occurs when an ecosystem starts on bare rock, where no other species have lived.

• Primary succession may occur in an ecosystem destroyed by a hurricane. Secondary succession occurs when new sand dunes are formed.

• Primary succession can include the process of lava cooling to form rock, which is then broken down to form soil in which plants can grow. Secondary succession occurs on land that was once cleared for farming.

Which question is most relevant to an ecosystem beginning primary succession?

• Why is there no soil, grass, or shrubs present in the ecosystem?

• Why are there so many kinds of animals living in the ecosystem?

• What types of hardwood trees are growing in the ecosystem?

• What caused the forest fire that destroyed the previous ecosystem?

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NGSS.MS-LS2-3

After a wheat field is cleared, wild grasses and weeds begin growing. This process is considered —

• primary succession because pioneer species appear

• primary succession because there are no large trees

• secondary succession because soil is already present

• secondary succession because the field contains inorganic matter

Tags

NGSS.MS-LS2-4

An energy pyramid is shown. Which statement best describes the organism with the most energy in this pyramid?

• Producers

• Primary Consumers

• Secondary Consumers

• Tertiary

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NGSS.MS-LS2-3

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A food web is shown. What is the total number of secondary consumers?

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NGSS.MS-LS2-2

What role do dragonflies play on the food web?

• Primary Consumers

• Producers

• Apex

• Secondary Consumers

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NGSS.MS-LS2-1

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What is the relationship between bats and raccoons?

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NGSS.MS-LS2-1

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Which change would most likely cause a decrease in the frog population?

• An increase in the ladybird population

• An increase in the butterfly population

• An increase in the snake population

• An increase in the number of producers

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NGSS.MS-LS2-1

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Two plant species that grow in the same area are shown. Which statement best explains a difference between Plant 1 and Plant 2?

• Plant 1 obtains more water from the soil because of its root surface area and root depth.

• Plant 1 obtains more sunlight because of its root surface area and root depth.

• Plant 2 obtains more water from the soil because of its root surface area and root depth.

• Plant 2 obtains more sunlight because of its root surface area and root depth.

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NGSS.MS-LS2-1

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Sea anemones and clown fish live together in the ocean. Which statement best describes one way sea anemones depend on clown fish for an abiotic factor in an ecosystem?

• Clown fish protect sea anemones from predatory fish.

• Clown fish decrease competition among sea anemones.

• Clown fish consume the remains of organisms paralyzed by sea anemones.

• Clown fish move water near sea anemones when dissolved oxygen levels are low.