Which of the following sequences correctly represents the flow of electrons during photosynthesis? a. NADPH → O 2 → CO 2 b. H 2 O → NADPH → Calvin cycle c. H 2 O → photosystem I → photosystem II d. NADPH → electron transport chain → O 2

Hi everyone here we have a question asking which one of these Which one of the following is the final except er of electrons. During light reactions of photosynthesis, A N A D P H. B, oxygen. See photo System two or D carbon dioxide. So let's look at the light dependent reactions. They use energy from sunlight and water to produce a T. P. In A. D. P. H and oxygen and r N a D P H is going to be the final except er of electrons during the light reactions. So our answer here is A N A D P H. Thank you for watching. Bye.

Ch. 10 - Photosynthesis

Campbell - Campbell Biology 12th Edition

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Urry 12th Edition

Ch. 10 - Photosynthesis

Problem 2

Chapter 10, Problem 2

Which of the following sequences correctly represents the flow of electrons during photosynthesis?
a. NADPH → O₂ → CO₂
b. H₂O → NADPH → Calvin cycle
c. H₂O → photosystem I → photosystem II
d. NADPH → electron transport chain → O₂

Verified step by step guidance

Understand the process of photosynthesis, which involves two main stages: the light-dependent reactions and the Calvin cycle (light-independent reactions).

In the light-dependent reactions, water (H2O) is split to release electrons, protons, and oxygen (O2). This occurs in the thylakoid membranes of chloroplasts.

These electrons are transferred through a series of proteins known as the electron transport chain, which includes photosystem II and photosystem I.

The electrons eventually reduce NADP+ to form NADPH, which is then used in the Calvin cycle to help convert carbon dioxide (CO2) into glucose.

Identify the correct sequence of electron flow during photosynthesis: H2O provides electrons, which move through photosystem II and photosystem I, and are finally used to form NADPH, which is utilized in the Calvin cycle.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Photosynthesis Electron Flow

During photosynthesis, electrons flow from water (H2O) through the photosystems and into the Calvin cycle. Initially, water molecules are split in photosystem II, releasing electrons, which then move through the electron transport chain to photosystem I, where they are used to reduce NADP+ to NADPH. This NADPH is then utilized in the Calvin cycle to help convert CO2 into glucose.

Photosystems I and II

Photosystems I and II are integral components of the light-dependent reactions in photosynthesis. Photosystem II captures light energy to initiate the electron transport chain by splitting water molecules, releasing oxygen and electrons. Photosystem I further energizes these electrons using light energy, facilitating their transfer to NADP+, forming NADPH, which is crucial for the Calvin cycle.

Calvin Cycle

The Calvin cycle, also known as the light-independent reactions, occurs in the stroma of chloroplasts and uses ATP and NADPH produced in the light-dependent reactions to convert carbon dioxide into glucose. This cycle involves carbon fixation, reduction, and regeneration of ribulose bisphosphate, enabling plants to synthesize sugars necessary for growth and energy storage.

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