Plants perform photosynthesis primarily for the following reasons:
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To build food molecules they can use as a source of energy: Photosynthesis converts light energy into chemical energy in the form of glucose, which plants use for energy.
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To make molecules they can use for growth so they can become bigger: The glucose produced during photosynthesis serves as a building block for other organic molecules that are essential for plant growth.
The other options about producing carbon dioxide and making a green color to attract insects are incorrect in this context. Plants actually use carbon dioxide during photosynthesis, and while the green color helps with photosynthesis, it is not the primary reason for performing it.