Multiple Choice
In the context of photosynthesis, where do primary consumers obtain their carbon?
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9. Photosynthesis
Introduction to Photosynthesis
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Which of the following is necessary for photosynthesis?
A
Oxygen ($\mathrm{O_2}$)
B
Carbon dioxide ($\mathrm{CO_2}$)
C
Nitrogen ($\mathrm{N_2}$)
D
Methane ($\mathrm{CH_4}$)
Verified step by step guidance1
Understand the process of photosynthesis: Photosynthesis is the process by which plants, algae, and some bacteria convert light energy into chemical energy stored in glucose. It requires specific reactants to occur.
Identify the key reactants in photosynthesis: The primary reactants are carbon dioxide ($\mathrm{CO_2}$) and water ($\mathrm{H_2O}$), along with light energy absorbed by chlorophyll.
Recall the chemical equation for photosynthesis: The general equation is $6\mathrm{CO_2} + 6\mathrm{H_2O} + \text{light energy} \rightarrow \mathrm{C_6H_{12}O_6} + 6\mathrm{O_2}$. This shows that $\mathrm{CO_2}$ is a necessary input.
Evaluate the options provided: Oxygen ($\mathrm{O_2}$) is a product of photosynthesis, not a reactant. Nitrogen ($\mathrm{N_2}$) and methane ($\mathrm{CH_4}$) are not involved in the photosynthetic process. Carbon dioxide ($\mathrm{CO_2}$) is the correct answer as it is a required reactant.
Conclude that carbon dioxide ($\mathrm{CO_2}$) is necessary for photosynthesis because it is used in the Calvin cycle to produce glucose, which is the primary energy storage molecule for plants.
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