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Unit 2 Practice FRQ

Write your answers in the spaces provided. Refer to the figure or diagram to answer the question. Where
explanation or discussion is required, support your answers with relevant information and/or specific examples.

The image above shows the various stages of succession.

Question 1

Short answer
Identify the oldest stage of succession shown in the figure above.

Question 2

Short answer
Pioneer species are important in ecological succession. Identify a pioneer species that could be found in an ecosystem like the one in the figure above.

Question 3

Short answer
Pioneer species are important in ecological succession. Describe the role of pioneer species in early succession.

Question 4

Short answer
Explain one adaptation that helps grasses succeed in grasslands, rather than forests.

Question 5

Short answer
Soil organisms, such as mycorrhizal fungi, impact the rate of succession in ecosystems. Mycorrhizal fungi
have a mutualistic relationship with various species of plants and increase the plant growth and survival. Sand dunes often lack mycorrhizal fungi, and a researcher wanted to determine the effect of adding mycorrhizal species to sand on disturbed beaches on grass growth. The researcher set up various mycorrhizal communities at disturbed beaches in different locations on the east coast of the United States.

Identify the independent variable in the study.

Question 6

Short answer
Soil organisms, such as mycorrhizal fungi, impact the rate of succession in ecosystems. Mycorrhizal fungi
have a mutualistic relationship with various species of plants and increase the plant growth and survival. Sand dunes often lack mycorrhizal fungi, and a researcher wanted to determine the effect of adding mycorrhizal species to sand on disturbed beaches on grass growth. The researcher set up various mycorrhizal communities at disturbed beaches in different locations on the east coast of the United States.

Identify the dependent variable in the study.

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