AP BIOLOGY

Detailed explanation-1: -Stroma. It is a colourless, alkaline, aqueous, protein-rich fluid present within the inner membrane of the chloroplast present surrounding the grana.

Detailed explanation-2: -Stroma is the fluid filling up the inner space of the chloroplasts which encircle the grana and the thylakoids. In addition to providing support to the pigment thylakoids, the stroma are now known to contain chloroplast DNA, starch and ribosomes along with enzymes needed for Calvin cycle.

Detailed explanation-3: -Structure of Stroma – Stroma in Chloroplast Stroma is made of an outer membrane and a complex network of inner membranes that goes on to form the grana – disc like structures arranged in a stack. Membranous extensions connect various grana together.

Detailed explanation-4: -The stroma is now known to contain chloroplast DNA, starch, and ribosomes, as well as enzymes required for the Calvin cycle, in addition to supporting the pigment thylakoids. Other support structures, such as connective tissues or fungal tissues conveying spores, are also referred to as stroma.

Detailed explanation-5: -Stroma-The stroma is the liquid inside the chloroplast where other structures such as the thylakoids float.