noun
- a stack of flattened membranous sacs (thylakoids) found in chloroplasts where light reactions of photosynthesis occur
Usage: biology; plural: grana
Examples
- The granum is the site of light-dependent reactions in photosynthesis.
- Chloroplasts contain multiple grana stacked together to maximize light absorption.
- Thylakoids are organized into stacks called grana within the chloroplast.
- The structure of a granum allows for efficient energy conversion in plant cells.
- Students learned that grana contain chlorophyll and other photosynthetic pigments.