Which substance contains thykoids?
Thylakoids are membrane-bound structures found within chloroplasts in plant cells and in the cells of some photosynthetic organisms, such as cyanobacteria. They contain chlorophyll and other pigments essential for photosynthesis, facilitating the conversion of light energy into chemical energy. Thylakoids are organized into stacks known as grana, which are interconnected by stroma thylakoids.