Multiple Choice
What do plants do with the carbon they take in from the atmosphere during photosynthesis?
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9. Photosynthesis
Introduction to Photosynthesis
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In the context of photosynthesis, where do primary consumers obtain their carbon?
A
Directly from atmospheric CO$_2$
B
From inorganic minerals in the soil
C
From organic molecules produced by autotrophs
D
From sunlight absorbed during feeding
Verified step by step guidance1
Understand the concept of photosynthesis: Photosynthesis is the process by which autotrophs (like plants, algae, and some bacteria) convert light energy into chemical energy stored in organic molecules, primarily glucose. These organic molecules contain carbon derived from atmospheric CO$_2$.
Define primary consumers: Primary consumers are organisms that feed directly on autotrophs (producers). Examples include herbivores like cows, rabbits, and insects. They rely on autotrophs for their energy and carbon needs.
Explain the source of carbon for primary consumers: Primary consumers obtain their carbon by consuming organic molecules (like carbohydrates, proteins, and lipids) produced by autotrophs during photosynthesis. These molecules contain carbon originally fixed from atmospheric CO$_2$.
Clarify why other options are incorrect: Primary consumers do not obtain carbon directly from atmospheric CO$_2$, as they lack the ability to perform photosynthesis. They also do not derive carbon from inorganic minerals in the soil or sunlight, as these are not sources of organic carbon.
Summarize the correct answer: The carbon in primary consumers comes from organic molecules produced by autotrophs during photosynthesis, which is why the correct answer is 'From organic molecules produced by autotrophs.'
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