Multiple Choice
In the evolutionary history of life on Earth, which group of organisms is thought to have evolved oxygenic photosynthesis first?
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9. Photosynthesis
Introduction to Photosynthesis
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In an introduction to photosynthesis, which statement best describes how chemosynthesis differs from photosynthesis?
A
Chemosynthesis produces oxygen as a byproduct, whereas photosynthesis does not produce oxygen.
B
Chemosynthesis requires chlorophyll and sunlight, whereas photosynthesis does not require pigments.
C
Chemosynthesis occurs only in plants, whereas photosynthesis occurs only in bacteria and archaea.
D
Chemosynthesis uses energy from oxidizing inorganic chemicals to fix 2 2
Verified step by step guidance1
Understand the basic definitions: Photosynthesis is the process by which organisms use light energy to convert carbon dioxide (CO\_2) and water into organic molecules and oxygen. Chemosynthesis, on the other hand, is a process where organisms produce organic molecules using energy derived from the oxidation of inorganic chemicals, not light.
Identify the energy source for each process: Photosynthesis relies on sunlight as the energy source, while chemosynthesis uses chemical energy from inorganic compounds such as hydrogen sulfide or ammonia.
Recognize the role of pigments: Photosynthesis requires pigments like chlorophyll to capture light energy. Chemosynthesis does not require pigments because it does not depend on light.
Note the byproducts: Photosynthesis typically produces oxygen as a byproduct due to the splitting of water molecules. Chemosynthesis does not produce oxygen as a byproduct because it uses different chemical reactions.
Summarize the key difference: Chemosynthesis fixes carbon dioxide into organic molecules using chemical energy from inorganic compounds, whereas photosynthesis fixes carbon dioxide using light energy.
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