Question

what part of photosynthesis involves an electron transport chain? a light - independent reactions b the krebs cycle c light - dependent reactions

Explanation:

• Light - independent reactions: Also known as the Calvin cycle, it mainly focuses on carbon fixation (using \(CO_2\) to make organic molecules like glucose) and does not directly involve an electron transport chain.
• The Krebs cycle: This is part of cellular respiration (not photosynthesis). It generates \(NADH\) and \(FADH_2\) through a series of chemical reactions, but it is not related to the electron transport chain in photosynthesis.
• Light - dependent reactions: In these reactions, light energy is absorbed by chlorophyll. Electrons are excited and pass through an electron transport chain (such as in photosystem II and photosystem I). This electron transport chain is involved in generating ATP (through chemiosmosis) and reducing power (\(NADPH\)).

Answer:

C. light - dependent reactions