Multiple Choice
In the context of photosynthesis, what is the primary role of solar energy when it is absorbed by chlorophyll in plant cells?
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9. Photosynthesis
Introduction to Photosynthesis
Multiple Choice
How did the evolution of photosynthetic life alter Earth's atmosphere?
A
It caused a significant rise in atmospheric methane levels.
B
It led to the complete removal of carbon dioxide from the atmosphere.
C
It decreased the amount of nitrogen in the atmosphere.
D
It increased the concentration of oxygen, leading to the development of an oxygen-rich atmosphere.
Verified step by step guidance1
Understand the role of photosynthesis in Earth's history: Photosynthesis is a process by which organisms like plants, algae, and cyanobacteria convert carbon dioxide (CO₂) and water (H₂O) into glucose and oxygen (O₂) using sunlight. This process fundamentally altered Earth's atmosphere.
Recognize the key chemical reaction in photosynthesis: The general equation for photosynthesis is: . This reaction releases oxygen as a byproduct, which accumulates in the atmosphere.
Explore the timeline of oxygen accumulation: Photosynthetic organisms first appeared around 2.5 billion years ago. Over time, their activity led to the gradual release of oxygen into the atmosphere, a phenomenon known as the Great Oxygenation Event (GOE).
Understand the impact of increased oxygen levels: The rise in atmospheric oxygen enabled the development of aerobic (oxygen-using) life forms and contributed to the formation of the ozone layer, which protects Earth from harmful ultraviolet radiation.
Clarify why other options are incorrect: Photosynthesis did not increase methane levels, remove all carbon dioxide, or decrease nitrogen. Instead, it increased oxygen concentration, fundamentally transforming Earth's atmosphere into an oxygen-rich environment.
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