DENDROLOGY

Detailed explanation-1: -In most higher plants, the thylakoids are arranged in tight stacks called grana (singular granum). Grana are connected by stromal lamellae, extensions that run from one granum, through the stroma, into a neighbouring granum. The thylakoid membrane envelops… …of flattened, disklike sacs called thylakoids.

Detailed explanation-2: -The thylakoid membrane forms a network of flattened discs called thylakoids, which are frequently arranged in stacks called grana. Because of this three-membrane structure, the internal organization of chloroplasts is more complex than that of mitochondria.

Detailed explanation-3: -Each granum is made up of a stack of closed compartment called thylakoids.