Plant cells synthesize sugar in the;

Explanation

Plant cells synthesize sugar in the stroma of chloroplasts. The stroma contains the enzymes necessary for the Calvin cycle, which is the process that converts carbon dioxide and other compounds into glucose. The thylakoids and grana are involved in the light-dependent reactions that produce ATP and NADPH, which are then used in the stroma for sugar synthesis. Christa is unrelated to chloroplasts and pertains to mitochondrial structure.