Choose the correct definition of oxygenic photosynthesis:

• A. It uses oxygen gas as the primary electron donor to produce water.
• B. It uses glucose as the electron primary donor to produce oxygen gas.
• C. It uses water as the electron primary donor to produce NAD⁺.
• D. It uses water as the electron primary donor to produce oxygen gas.

Answer: (D)

Verified step by step guidance

1. Understand the concept of photosynthesis: Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy into chemical energy stored in glucose.
2. Differentiate between oxygenic and anoxygenic photosynthesis: Oxygenic photosynthesis produces oxygen as a byproduct, while anoxygenic photosynthesis does not.
3. Identify the primary electron donor in oxygenic photosynthesis: In oxygenic photosynthesis, water (H2O) is used as the primary electron donor.
4. Recognize the products of oxygenic photosynthesis: The process results in the production of oxygen gas (O2) as a byproduct.
5. Connect the steps: Water is split into oxygen, protons, and electrons during the light-dependent reactions, which are then used to produce ATP and NADPH, essential for the Calvin cycle.