SCSHS Biochemical Cycles Quiz

What is the process by which nitrogen is converted into various chemical forms as it circulates among the atmosphere, soil, and organisms?

• Nitrogen cycle

• Carbon cycle

• Hydrogen cycle

• Oxygen cycle

Which type of bacteria are responsible for converting atmospheric nitrogen into a form that plants can use?

• Nitrogen-reducing bacteria

• Oxygen-producing bacteria

• Nitrogen-fixing bacteria

• Carbon-fixing bacteria

What is the role of denitrifying bacteria in the nitrogen cycle?

• Convert nitrogen gas into nitrates

• Produce nitrates from nitrogen gas

• Convert nitrates into nitrogen gas

• Have no role in the nitrogen cycle

Explain the process of nitrification in the nitrogen cycle.

• Nitrification is the process by which ammonia is converted to nitrite and then to nitrate by nitrifying bacteria in the soil.

• Nitrification is the process of converting nitrate to nitrogen gas by nitrifying bacteria in the water.

• Nitrification is the process of converting nitrate to ammonia by denitrifying bacteria in the soil.

• Nitrification is the process of converting nitrite to ammonia by nitrifying bacteria in the air.

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How does human activity impact the nitrogen cycle?

• Human activity has no impact on the nitrogen cycle

• Human activity decreases nitrogen in the environment, leading to nitrogen deficiency

• Human activity has a positive impact on the nitrogen cycle

• Human activity can increase nitrogen in the environment, leading to pollution and disruption of the nitrogen cycle.

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What is the primary source of carbon in the carbon cycle?

• water (H2O)

• nitrogen (N2)

• oxygen (O2)

• carbon dioxide (CO2)

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Explain the process of photosynthesis in the carbon cycle.

• Animals use sunlight to convert carbon dioxide and water into glucose and oxygen.

• Plants use sunlight to convert carbon dioxide and water into glucose and oxygen.

• Plants use moonlight to convert carbon dioxide and water into glucose and nitrogen.

• Plants use sunlight to convert nitrogen and water into glucose and carbon dioxide.

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What role do decomposers play in the carbon cycle?

• They break down dead organisms and organic matter, releasing carbon dioxide back into the atmosphere.

• They have no role in the carbon cycle.

• They absorb carbon dioxide from the atmosphere and store it in the soil.

• They convert carbon dioxide into oxygen through photosynthesis.

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How does deforestation impact the carbon cycle?

• It decreases atmospheric carbon levels

• It has no impact on atmospheric carbon levels

• It increases atmospheric carbon levels

• It only impacts the carbon levels in the soil

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What is the significance of fossil fuel combustion in the carbon cycle?

• Contributes to the decrease in atmospheric carbon dioxide levels

• Contributes to the increase in atmospheric carbon dioxide levels

• Has no impact on atmospheric carbon dioxide levels

• Reduces atmospheric carbon dioxide levels

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