Question

Which one of the following products diffuses out of the chloroplast during photosynthesis?

• A. ADP
• B. NADPH
• C. $O_2$
• D. ATP

Answer 1

Answer: (C)

$O_2$

Answer 2

During photosynthesis, the light-dependent reactions in the chloroplast produce ATP, NADPH, and O$_2$. Of these, oxygen (O$_2$) diffuses out of the chloroplast as a byproduct. ATP and NADPH are used within the chloroplast to drive the light-independent reactions (Calvin cycle), which produce sugars.