AP BIOLOGY

Detailed explanation-1: -Stroma is the fluid-filled internal space of the chloroplasts which encircle the grana and the thylakoids. It contains chloroplast DNA, starch and ribosomes along with enzymes needed for the Calvin cycle.

Detailed explanation-2: -Stroma, in botany, refers to the colorless fluid surrounding the grana within the chloroplast.

Detailed explanation-3: -The stroma is the fluid portion of the chloroplast located outside the thylakoids.

Detailed explanation-4: -In particular, their three membranes divide chloroplasts into three distinct internal compartments: (1) the intermembrane space between the two membranes of the chloroplast envelope; (2) the stroma, which lies inside the envelope but outside the thylakoid membrane; and (3) the thylakoid lumen.

Detailed explanation-5: -The thylakoids consist of the photosystems that serve as the site for absorption of sunlight. The surrounding space in the stacked grana is called stroma. The stroma contains dissolved enzymes, chloroplast genome and starch granules.