AP BIOLOGY

Detailed explanation-1: -Chloroplasts contain a system of membrane sacs, the thylakoids, some of which are stacked to form grana (singular, granum), whereas others float freely in the stroma . It is on the thylakoid membranes that the electron carriers necessary for photosynthesis reside.

Detailed explanation-2: -Final answer: The stack of thylakoids of chloroplast is called a granum.

Detailed explanation-3: -Each granum is made up of a stack of closed compartment called thylakoids. Each thylakoid consists of two parallel membranes joined at their margins. The membranes of thylakoids contain the layer of particles called chlorophyll.

Detailed explanation-4: -The major function of grana is to conduct the photosynthesis process. Grana (thylakoid membrane to be exact) is the site where light reactions of photosynthesis occur.

Detailed explanation-5: -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.