Multiple Choice
Chlorophyll not only gives green plants their color but also ________.
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9. Photosynthesis
Introduction to Photosynthesis
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If chloroplasts are isolated from a plant cell and exposed to light, they release ______.
A
nitrogen ($N_2$)
B
carbon dioxide ($CO_2$)
C
glucose ($C_6H_{12}O_6$)
D
oxygen ($O_2$)
Verified step by step guidance1
Understand the role of chloroplasts: Chloroplasts are organelles in plant cells responsible for photosynthesis, a process that converts light energy into chemical energy stored in glucose while releasing oxygen as a byproduct.
Recall the photosynthesis equation: The general equation for photosynthesis is: . This shows that oxygen ($O_2$) is released during photosynthesis.
Focus on the light-dependent reactions: In the presence of light, chloroplasts carry out the light-dependent reactions of photosynthesis, where water ($H_2O$) is split into oxygen ($O_2$), protons, and electrons through a process called photolysis.
Identify the byproduct of photolysis: During photolysis, oxygen ($O_2$) is released as a byproduct, which is why isolated chloroplasts exposed to light release oxygen.
Conclude the reasoning: Based on the photosynthesis process and the role of chloroplasts, the correct answer is oxygen ($O_2$), as it is the byproduct of the light-dependent reactions when chloroplasts are exposed to light.
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