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Which of the following best describes the relationship between photosynthesis and cellular respiration?
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9. Photosynthesis
Introduction to Photosynthesis
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What is the overall purpose of photosynthesis?
A
To break down glucose and release energy
B
To absorb nutrients from the soil
C
To convert light energy into chemical energy stored in glucose
D
To produce carbon dioxide from oxygen
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Step 1: Begin by understanding the process of photosynthesis. Photosynthesis is a biochemical process that occurs in plants, algae, and some bacteria, where light energy is converted into chemical energy stored in glucose molecules.
Step 2: Recognize the key components involved in photosynthesis. These include sunlight (light energy), water (H₂O), carbon dioxide (CO₂), and chlorophyll (the pigment in chloroplasts that absorbs light).
Step 3: Break down the chemical reaction of photosynthesis. The general equation is: . This shows that carbon dioxide and water, in the presence of sunlight, produce glucose and oxygen.
Step 4: Clarify the purpose of photosynthesis. The primary goal is to convert light energy into chemical energy stored in glucose, which serves as an energy source for the plant and other organisms that consume it.
Step 5: Address the incorrect options. Photosynthesis does not break down glucose to release energy (this is cellular respiration), nor does it absorb nutrients from the soil (this is nutrient uptake). It also does not produce carbon dioxide from oxygen; instead, it releases oxygen as a byproduct.
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