Here's a breakdown:
* Chloroplast: The organelle within plant cells where photosynthesis occurs.
* Thylakoid: A flattened, disc-shaped membrane sac found within the chloroplast.
* Grana: Stacks of thylakoids, which resemble piles of coins.
The light-dependent reactions occur within the thylakoid membranes, where chlorophyll and other pigments capture light energy. This energy is used to produce ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate), which are then used in the light-independent reactions (Calvin cycle) to produce sugars.
