Final answer:
Leaves have the highest concentration of chloroplasts for photosynthesis.
Explanation:
The plant organ that contains the highest concentration of chloroplasts responsible for photosynthesis is the leaves. In leaves, cells of the palisade mesophyll contain the most chloroplasts, where photosynthesis primarily takes place, converting light energy into chemical energy.
Learn more about Chloroplasts and photosynthesis here:
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