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  • Photosynthesis: Where It Begins and Ends in Plant Cells
    Photosynthesis begins in the chloroplasts of a plant cell, specifically within the thylakoid membrane.

    Here's a breakdown:

    * Light-dependent reactions: These reactions happen in the thylakoid membrane, where light energy is captured by chlorophyll and used to split water molecules. This produces ATP (energy) and NADPH (electron carrier) which are used in the next stage.

    * Light-independent reactions (Calvin cycle): These reactions occur in the stroma, the fluid-filled space surrounding the thylakoids. Here, carbon dioxide from the atmosphere is used to synthesize sugars using the energy and electrons from the light-dependent reactions.

    So, while the process of photosynthesis begins in the thylakoid membrane with the capturing of light energy, it ultimately ends in the stroma with the production of glucose, the primary energy source for the plant.

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