granum
a stack of thylakoids located inside a chloroplast
In botany, a granum is a stack of thylakoids (membrane-bound compartments) within the chloroplast of a plant cell. These thylakoid membranes contain pigments such as chlorophyll, which are essential for photosynthesis (the process by which plants convert light energy into chemical energy). Granum are typically found in higher plant cells and are responsible for harvesting and storing energy from sunlight during photosynthesis. The number of granum in a chloroplast can vary depending on the specific plant species and environmental conditions, with some species having only one and others having up to several hundred granum per chloroplast. The shape and arrangement of granum, as well as their size, can also vary depending on the plant species and environmental conditions. Overall, the granum plays a key role in the photosynthetic process and plant growth.
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