13.3

Question 1

how is carbon dioxide removed from the environment

Answer 1

photosynthesis, feeding, fossil fuel

Question 2

how does photosynthesis removed carbon dioxide from environment

Answer 2

green plants absorb carbon dioxide from the atmosphere and use it to synthesise carbohydrates

Question 3

how does feeding remove carbon dioxide from the environment

Answer 3

when animals feed on green plants, the carbon compounds become part of their bodies

Question 4

how does fossil fuels remove carbon dioxide from the environment

Answer 4

carbon compounds may be preserved as fossil fuels like coal, natural gas and oil

Question 5

how is carbon dioxide released into the environment

Answer 5

respiration, combustion, decomposition

Question 6

how does respiration release carbon dioxide into the environment

Answer 6

plants and animals respire, releasing carbon dioxide into the atmosphere

Question 7

how does combustion release carbon dioxide into the environment

Answer 7

the combustion of fossil fuels such as coal and natural gas release carbon dioxide into the atmosphere

Question 8

how does decomposition release carbon dioxide into the environment

Answer 8

decomposers break down dead organic matter and release carbon dioxide into the atmosphere

Question 9

importance of carbon cycle? (3 points)

Answer 9

• ensures a continuous supply of carbon dioxide for photosynthesis(role of chlorophyll)
• enables a linear flow of energy through the ecosystem through photosynthesis, feeding, respiration,decomposition
• regulates the amount of carbon dioxide in the atmosphere