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Which organism is typically considered a producer in a food chain involving photosynthesis?
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9. Photosynthesis
Introduction to Photosynthesis
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Which process in living organisms evolved as oxygen levels increased in Earth's atmosphere?
A
Anaerobic respiration
B
Photosynthesis
C
Fermentation
D
Aerobic respiration
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Understand that the Earth's atmosphere originally had very low levels of oxygen. Early life forms relied on processes that did not require oxygen, such as anaerobic respiration and fermentation.
Recognize that photosynthesis, particularly by cyanobacteria, began to increase oxygen levels in the atmosphere. This process uses sunlight to convert carbon dioxide and water into glucose and oxygen.
As oxygen levels increased, organisms that could utilize oxygen for energy production had a selective advantage. This led to the evolution of aerobic respiration.
Aerobic respiration is a process that uses oxygen to convert glucose into ATP, carbon dioxide, and water. It is more efficient than anaerobic processes, producing more ATP per glucose molecule.
Conclude that aerobic respiration evolved as a response to the increased oxygen levels in the atmosphere, allowing organisms to exploit this new resource for more efficient energy production.
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