Plants take in oxygen and release sugar. Plants take in sugar and release minerals. Plants take in minerals and release carbon dioxide. Plants take in carbon dioxide and release oxygen.
I gave my students this multiple choice question: Which is a process that occurs during photosynthesis?

Only one answer is correct among these 4 choices:
- Plants take in oxygen and release sugar.
- Plants take in sugar and release minerals.
- Plants take in minerals and release carbon dioxide.
- Plants take in carbon dioxide and release oxygen.

Could you tell me which one is correct?

Plants take in carbon dioxide and release oxygen.