Question

Which of the following is correct regarding photosynthesis?

A. During oxygenic photosynthesis, water is used as a source of electrons; during non-oxygenic photosynthesis, hydrogen sulfide is used as a source of electrons.
B. During oxygenic photosynthesis, oxygen is used as a source of electrons; during non-oxygenic photosynthesis, hydrogen sulfide is used as a source of electrons.
C. During oxygenic photosynthesis, oxygen is used as a source of electrons; during non-oxygenic photosynthesis, water is used as a source of electrons.
D. During oxygenic photosynthesis, hydrogen sulfide is used as a source of electrons; during non-oxygenic photosynthesis, water is used as a source of electrons.

Answer 1

The correct answer is A, which states that water is used as an electron source in oxygenic photosynthesis, and hydrogen sulfide is used in non-oxygenic photosynthesis.

Step-by-step explanation:

The correct statement regarding photosynthesis is: A. During oxygenic photosynthesis, water (H2O) is used as a source of electrons; during non-oxygenic photosynthesis, hydrogen sulfide (H2S) is used as a source of electrons. In oxygenic photosynthesis, oxygen (O2) is produced as a byproduct when water is split to supply electrons to the reaction center. In contrast, anoxygenic photosynthesis does not produce oxygen because it uses other reduced compounds such as hydrogen sulfide (H2S) or thiosulfate as the electron donor, and thus, oxygen is not released in the process.