Correct Answer: D

Rationale: The leaf is the primary site of photosynthesis in plants, where light energy is converted into chemical energy in the form of glucose. Inside the leaf, specialized cells containing chloroplasts absorb sunlight through chlorophyll pigments. Carbon dioxide enters through tiny pores called stomata, and water is delivered from the roots via the xylem. These components drive the photosynthetic process, producing food for the plant and releasing oxygen as a byproduct. The leaf’s broad surface area and internal structure are optimized for light absorption and gas exchange, making it the plant’s energy factory.

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