AP Biology Unit 8 Review

Which statement best describes energy transfer in a food web?

• energy is transferred to consumers which convert it to nitrogen compounds and use it to synthesize amino acids

• energy from producers is converted into oxygen and then converted to consumers

• energy from the sun is stored in green plants and transferred to consumers

• energy moves from autotrophs to heterotrophs to decomposers, which convert it into a form producers can use again

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SYI-2

Reorder the following levels of organization from Smallest to BIGGEST

• Ecosystem

• Biosphere

• Organism

• Population

• Community

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SYI-1

The ecosystem includes all of the ​ (a)   factors, such as plants, animals and bacteria, as well as all of the ​ (b)   factors, such as rocks, water and sunlight.

• biotic
• abiotic

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SYI-1

Match the following types of symbiosis:

• Mutualism

• When one species benefits and the other is unaffected

  + / 0

• Parasitism

• When two species help each other survive

  + / +

• Competition

• When two species are both need the same resource

  - / -

• Commensalism

• When one species benefits at the expense of the other

  + / -

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SYI-2

Lynx eat rabbits. The graph shows change in population size for the rabbits. Draw a line to show the change in population for the lynx.

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SYI-1

What percent of available energy is generally passed from one trophic level to the next?

• 1%

• 10%

• 50%

• 80%

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SYI-2

Match the following trophic levels to their descriptions

• Secondary consumer

• eats primary consumers (carnivore)

• Apex predator

• eats producers (herbivore)

• Primary consumer

• breaks down dead matter from all trophic levels

• Producer

• makes its own food, often using the sun's energy

• Decomposer

• the top of the food chain - consumer

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SYI-1

A species that has a disproportionate impact on the ecosystem compared to its population size and generally benefits the other organisms is which of the following?

• Keystone species

• Invasive species

• Parasitic species

• Extinct species

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SYI-1

The carbon cycle is an important ​ (a)   cycle in all ecosystems. In this syscle, ​ (b)   is absorbed from the atmosphere by plants doing photosynthesis. Animals receive carbon in the form of ​ (c)   by eating plants. Cellular respiration in both plants and animals releases ​ (d)   back into the atmosphere.

• abiotic
• carbon dioxide
• glucose

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SYI-1

What is the main gas in the atmosphere that we breathe?

• Nitrogen

• Oxygen

• Carbon dioxide

• Helium

Answer explanation

70% of the atmosphere is nitrogen, which is inhaled and exhaled when we breathe, but does not impact us.

Tags

SYI-1