Multiple Choice
Which of the following statements accurately describes vitamin A's role in vision?
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9. Photosynthesis
Introduction to Photosynthesis
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How do plants obtain the carbon dioxide ($\mathrm{CO_2}$) required for photosynthesis?
A
By converting oxygen ($\mathrm{O_2}$) into carbon dioxide inside chloroplasts
B
By absorbing it from the soil through their roots
C
By producing it internally during cellular respiration
D
By absorbing it from the atmosphere through stomata in their leaves
Verified step by step guidance1
Understand the role of carbon dioxide ($\mathrm{CO_2}$) in photosynthesis: Plants use $\mathrm{CO_2}$ as a raw material to produce glucose during the light-independent reactions (Calvin cycle) in chloroplasts.
Learn about stomata: Stomata are small openings on the surface of leaves that allow gases like $\mathrm{CO_2}$ to enter and oxygen ($\mathrm{O_2}$) to exit. They are regulated by guard cells to control gas exchange and water loss.
Clarify the source of $\mathrm{CO_2}$: Plants do not convert $\mathrm{O_2}$ into $\mathrm{CO_2}$, nor do they absorb $\mathrm{CO_2}$ from the soil. Instead, they absorb $\mathrm{CO_2}$ directly from the atmosphere through their stomata.
Explain why cellular respiration is not the source: Cellular respiration in plants produces $\mathrm{CO_2}$ as a byproduct, but this $\mathrm{CO_2}$ is not sufficient to meet the needs of photosynthesis. Plants rely on atmospheric $\mathrm{CO_2}$ for photosynthesis.
Conclude with the correct process: Plants obtain the $\mathrm{CO_2}$ required for photosynthesis by absorbing it from the atmosphere through stomata in their leaves.
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