A. Cytoplasm
A.
B. Stroma
B.
C. Thylakoid
C.
D. Nucleus
D.
Correct Answer: B
সঠিক উত্তর: B
Explanation
ব্যাখ্যা
The Calvin cycle is a series of reactions that occur within the stroma, the fluid-filled region inside the chloroplast. This is where carbon dioxide is fixed into organic molecules using energy from ATP and NADPH produced during the light reactions.