granum
/ˈɡreɪnəm/
noun
- A stack of disk-like structures inside a plant cell's chloroplast where photosynthesis takes place.
- Under a microscope, you can see the grana arranged like stacks of coins.
- Each granum contains chlorophyll that captures sunlight for the plant.
- The number of grana in a chloroplast can increase with more light exposure.