1 The measure of a complete circle, in radians, is 2Ï. 2  A radian is defined as the ratio of the arc length, ââsââ to the length of the radius âârââ. 3  One radian is equal to a little less than 57.3 degrees.
A thylakoid is a membrane-bound compartment inside chloroplasts and cyanobacteria. They are the site of the light-dependent reactions of photosynthesis. Thylakoids consist of a thylakoid membrane surrounding a thylakoid lumen.Chloroplast thylakoids frequently form stacks of disks referred to as grana (singular: granum).n higher plants thylakoids are organized into a granum-stroma membrane assembly. A granum (plural grana) is a stack of thylakoid discs. Chloroplasts can have from 10 to 100 grana.
Chloroplasts are organelles present in plant cells and some eukaryotic organisms. Chloroplasts are the most important plastids found in plant cells. It is the structure in a green plant cell in which photosynthesis occurs.Chloroplast is one of the three types of plastids.The chloro plasts take part in the process of photosynthesis and it is of great biological importance. Animal cells do not have chloroplasts.he chloroplast are double membrane bound organelles and are the site of photosynthesis The chloroplasts have a system of three membranes: the outer membrane, the inner membrane and the thylakoid system. The outer and the inner membrane of the chloroplast enclose a semi-gel-like fluid known as the stroma.