AP BIOLOGY

Detailed explanation-1: -A stack of thylakoid disk is organized to form grana. There are about 10 to 100 thylakoids within a granum and about 40-60 grana in a plant cell.

Detailed explanation-2: -Thylakoids are interconnected disc-like sacs of the internal membrane system of the chloroplast. They are found suspended in the stroma. Thylakoids are arranged in a stack, which is called grana. The thylakoid membrane contains the photosynthetic pigment chlorophyll, which absorbs the sunlight during photosynthesis.

Detailed explanation-3: -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.

Detailed explanation-4: -Grana are stacked thylakoids, which are membrane-bound, flattened discoid sacs that hold chlorophyll molecules. They are the fundamental functioning units of chloroplasts. Stroma is the homogenous matrix in which grana are embedded. Photosynthetic enzymes, starch grains, DNA, and ribosomes make up Stroma.

Detailed explanation-5: -Thylakoids are located as stacks called grana in the stroma (matrix) of chloroplast.