7th grade Chapter 9 test review

An organism that can make its own food is called a

• consumer.

• decomposer.

• producer.

• scavenger.

In which process do producers use carbon from carbon dioxide to produce other carbon-containing molecules?

• the nitrogen cycle

• photosynthesis

• precipitation

• the water cycle

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How do most animals obtain nitrogen to build their body proteins?

• They breathe in free nitrogen directly from the air.

• They eat nitrogen-containing compounds found in the soil.

• They eat plants after bacteria have turned nitrogen into a usable form.

• They are able to convert nitrogen in the soil into usable compounds.

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A fire destroys a forest in Colorado. What would happen in the area if secondary succession did not occur after the fire?

• It would take longer for soil to form there and new plants to grow

• Seeds left in the soil would grow there and dominate the landscape.

• Different species of plants would grow there.

• New plants would not grow there.

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What determines an organism's energy role?

• How it breaks down biotic wastes

• How it moves through an ecosystem

• How it produces food and how it consumes other organisms

• How it obtains food and how it interacts with other organisms

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In an ecosystem, carbon and oxygen are both

• decreased.

• recycled.

• wasted.

• None of the above

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Why is nitrogen gas called “free” nitrogen?

• Because it makes up about 78 percent of the air around us

• Because it is released into the air by certain bacteria

• Because it is not combined with other kinds of atoms

• Because most organisms cannot use it

Which are the two main factors that determine an area's biome?

• Habitats and temperature

• Precipitation and population

• Precipitation and temperature

• Temperature and organisms

Why is sunlight important to all aquatic ecosystems?

• Aquatic producers need sunlight to make food and release oxygen.

• Aquatic organisms cannot carry out life processes in the dark.

• Sunlight allows fish to see their surroundings, even at depth.

• All of the above

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How does area usually affect biodiversity within an ecosystem?

• A smaller area will usually contain more species than a larger area.

• A larger area will usually contain more species than a smaller area.

• A larger area will usually contain about the same number of species as a smaller area.

• Area has no effect on biodiversity.

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