7th Grade Science FInal

A food web is a graphical representation that shows the interconnections of food chains as they exist in nature in their environment. According to the food web, which organism is the top consumer?

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The following is a table with various organisms and their role in an ecosystem. Which of the following food chains are possible based on the table provided? Select TWO correct answers.

• A. grass → redtail hawk → raccoon

• B. elderberry → deer → bobcat

• C. ocelot → jackrabbit → cattail

• D. cattail → wild boar → deer

• E. grass → jackrabbit → ocelot

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Analyze the food web. Which organism would be harmed the most if a landowner introduced a pesticide that killed all of the caterpillars?

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Select the trophic level that receives energy directly from the rabbits.

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Select the trophic level that receives energy directly from the grass.

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Which of the following receives direct energy from the producers?

• grass

• grasshopper

• shrew

• owl

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How did the producers create energy to introduce into the food chain?

• The producers create energy through photosynthesis, converting radiant energy from the Sun into chemical energy.

• The producers create energy by consuming and digesting nutrients.

• The producers create energy through photosynthesis, converting chemical energy from the Sun into mechanical energy.

• The producers create energy by hunting other animals.

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While the Earth has life, life has not been found on Mars. Which of the following is NOT a reason that Mars is not able to support life?

• Mars lacks water.

• Mars has a thin atmosphere.

• Mars is not close enough to the Sun.

• Mars does not have a protective magnetic field.

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Which of the following is an accurate reflection of the accommodations required for space travel? Select TWO correct answers.

• A. Astronauts are required to read on a daily basis because the brightness in outer space can negatively affect their eyesight.

• B. Astronauts require oxygen tanks because there is no atmosphere in outer space.

• C. Astronauts are required to do exercises while strapped in to avoid muscle and bone weakness due to weightlessness in outer space.

• D. Radios are required for communication in the space station because the lack of air in outer space trickles inside.

• E. Astronauts are required to wear gloves while on a space walk to avoid the harsh winds that frequently flow through outer space.

Earth is the only planet in our solar system that supports life, such as humans, plants, and cats. Which conditions on Earth support life? Select TWO correct answers.

• A. presence of water

• B. thin atmosphere

• C. above boiling temperatures

• D. distance from the Sun

• E. lack of carbon dioxide

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