Carbon Cycle

Which of the following add carbon dioxide to the atmosphere?

• volcanoes

• combustion of fossil fuels

• animal and plant respiration

• all of these

Answer explanation

All of the options listed contribute to carbon dioxide emissions. Volcanoes release CO2 during eruptions, combustion of fossil fuels produces CO2, and both animal and plant respiration release CO2 as a byproduct. Thus, the correct answer is 'all of these'.

Tags

NGSS.MS-LS2-3

NGSS.MS-ESS2-1

Organisms that do not decompose can be buried and become what?

• water

• nutrients

• air

• fossil fuels

Answer explanation

Organisms that do not decompose can be buried under layers of sediment over time. This process can lead to the formation of fossil fuels, such as coal, oil, and natural gas, which are derived from ancient organic matter.

The average temperature of the surface of Earth has increased approximately 1°C in the past century. Which reason best explains this increase in temperature?

• lower levels of ozone in the atmosphere

• lower levels of nitrogen in the atmosphere

• higher levels of carbon dioxide and other greenhouse gases in the atmosphere

• higher levels of oxygen in the atmosphere

Answer explanation

The increase in Earth's average temperature is primarily due to higher levels of carbon dioxide and other greenhouse gases, which trap heat in the atmosphere, leading to global warming.

Tags

NGSS.MS-ESS3-5

With the help of the Sun, through the process of photosynthesis, carbon dioxide is pulled from the air to make plant________

• leaves

• food

• roots

• nutrients

Answer explanation

Through photosynthesis, plants convert carbon dioxide and sunlight into food, primarily in the form of glucose. This process is essential for plant growth and energy, making 'food' the correct answer.

Tags

NGSS.MS-LS1-6

Which process contributes carbon dioxide to the atmosphere?

• respiration

• photosynthesis

• tree farms

Answer explanation

Respiration is the process by which living organisms convert glucose and oxygen into energy, releasing carbon dioxide as a byproduct. In contrast, photosynthesis absorbs carbon dioxide, making respiration the correct choice.

Which process removes carbon dioxide from the atmosphere?

• deforestation

• tree farms

• burning fossil fuels

• cellular respiration

Answer explanation

Tree farms actively grow trees, which absorb carbon dioxide during photosynthesis, thus removing it from the atmosphere. In contrast, deforestation and burning fossil fuels increase CO2 levels, while cellular respiration releases it.

Tags

NGSS.MS-LS1-6

When humans burn fossil fuels, most of the carbon quickly enters the                       as carbon dioxide.

• Water

• Atmosphere

• Sun

• Air

Answer explanation

When humans burn fossil fuels, the carbon released primarily enters the atmosphere as carbon dioxide. This process contributes to greenhouse gas emissions, impacting climate change.

Tags

NGSS.MS-ESS2-1

Respiration is the process by which animals take in _____ and release _____ to make energy. 

• photosynthesis, air

• carbon, oxygen

• oxygen

• oxygen, carbon dioxide

Answer explanation

Respiration involves animals taking in oxygen and releasing carbon dioxide to produce energy. This process is essential for cellular respiration, where oxygen is used to convert nutrients into energy.

What does NOT produce carbon dioxide?

• Photosynthesis

• Burning Fossil Fuels

• Animal respiration

• Plants decaying

Answer explanation

Photosynthesis is the process by which plants convert carbon dioxide and sunlight into glucose and oxygen, thus it does not produce carbon dioxide. In contrast, burning fossil fuels, animal respiration, and decaying plants all release CO2.

Tags

NGSS.MS-LS1-6

Carbon can be found in...

• The atmosphere

• Soil

• Fossil fuels

• All of the above

Answer explanation

Carbon is present in various forms: in the atmosphere as carbon dioxide, in soil as organic matter, and in fossil fuels like coal and oil. Therefore, the correct answer is 'All of the above'.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3