Which statement is not correct?

📌Concept:
-The Calvin-Benson cycle, also known as the Calvin cycle, is a set of chemical reactions that take place in chloroplasts during photosynthesis. The cycle is light-independent as it does not require light to proceed.
-The main purpose of the Calvin cycle is to convert carbon dioxide and other compounds into glucose. This cycle is crucial for the synthesis of carbohydrates in plants.
-The Calvin cycle utilizes ATP and NADPH produced during the light-dependent reactions of photosynthesis to drive its processes.

✅Explanation:
-In cyclic photophosphorylation, electrons proceed through only one transport system: This statement is correct. In cyclic photophosphorylation, electrons are cycled back to the photosystem I reaction center, passing through a single electron transport chain, which generates ATP without the production of NADPH or oxygen.
-In non-cyclic photophosphorylation electrons are transferred through two photosystems: This statement is correct. In non-cyclic photophosphorylation, electrons travel from water through photosystem II and photosystem I, ultimately producing ATP, NADPH, and oxygen as byproducts.
-In Calvin-Benson cycle, ATP and NADPH are provided by the light-dependent reactions: This statement is correct. The ATP and NADPH produced during the light-dependent reactions of photosynthesis are utilized in the Calvin cycle to convert CO2 into glucose and other carbohydrates.
-In Calvin-Benson cycle, CO2 is attached to RuBP to form a five-carbon sugar: This statement is incorrect. In the Calvin cycle, CO2 is attached to RuBP (ribulose-1,5-bisphosphate) to form an unstable six-carbon compound, which immediately splits into two molecules of 3-phosphoglycerate (3-PGA), each containing three carbon atoms. Thus, CO2 attachment to RuBP results in a six-carbon intermediate rather than a five-carbon sugar.