Question

A flattened disc like sac in chloroplast is called?

Answer 1

The chloroplast is enclosed in a double outer membrane, and its size approximates a spheroid about 2,500 nm thick and 5,000 nm long. Some single-celled algae have one chloroplast that occupies more than half the cell volume. the flattened disc like sac in chloroplast is called thylakoid. Thylakoids float freely within the chloroplast’s stroma. In higher plants, they form a structure called a granum that resembles a stack of coins 10 to 20 high. Membranes connect different grana to each other in a helical pattern, though some species have free-floating grana. The thylakoid membrane is composed of two layers of lipids that might contain molecules of phosphorus or sugar. Chlorophyll is embedded directly in the thylakoid membrane, which encloses the watery material known as the thylakoid lumen.