Match each event with its most suitable description.________ PGAL formation ________ ${\mathrm{CO}}_2$ fixation_______ photolysis_______ ATP forms; NADPH does nota. rubiscos functionb. water molecules splitc. ATP, NADPH requiredd. electrons cycled back to photosystem I

Key Concepts: Photosynthesis, Light Reactions, Calvin Cycle Explanation: The question asks for matching descriptions with events that take place in photosynthesis. The four events listed are PGAL formation, CO2 fixation, photolysis, and ATP formation with NADPH not being formed. This suggests that the question is focusing on the light-dependent reactions (photolysis) and the Calvin cycle (CO2 fixation, PGAL formation) that are part of photosynthesis. The answer choices given also help indicate that the event descriptions are in reference to these two parts of photosynthesis. Step by Step Solution: Step 1. Understand the question and the answer choices. Step 2. Identify the events that are being described: PGAL formation, CO2 fixation, photolysis, ATP formation. Step 3. Identify the significance of each event: PGAL formation and CO2 fixation are part of the Calvin cycle while photolysis and ATP formation are part of the light-dependent reactions. Step 4. Match each event to its most suitable description using the answer choices. The answers are as follows: PGAL formation --> rubisco function, CO2 fixation --> ATP, NADPH required, photolysis --> water molecules split, ATP forms; NADPH not required, electrons cycled back to photosystem I --> photolysis. Step 5. Write the final answer: PGAL formation --> rubisco function, CO2 fixation --> ATP, NADPH required, photolysis --> water molecules split, electrons cycled back to photosystem I --> photolysis. Final Answer: PGAL formation --> rubisco function, CO2 fixation --> ATP, NADPH required, photolysis --> water molecules split, electrons cycled back to photosystem I --> photolysis.