QuestionAugust 6, 2025

1. What is main difference between Photosystem II and Photosystem I? Photosystem I produces NADPH. Chlorophyll a and b absorb energy from sunlight during Photosystem I Photosystem Il is a part of the light-dependent stage. Photosystem I is a part of the light-independent phase. Electrons are energized and exit the pigment molecules during Photosystem II.

1. What is main difference between Photosystem II and Photosystem I? Photosystem I produces NADPH. Chlorophyll a and b absorb energy from sunlight during Photosystem I Photosystem Il is a part of the light-dependent stage. Photosystem I is a part of the light-independent phase. Electrons are energized and exit the pigment molecules during Photosystem II.
1. What is main difference between Photosystem II and Photosystem I?
Photosystem I produces NADPH.
Chlorophyll a and b absorb energy from sunlight during Photosystem I
Photosystem Il is a part of the light-dependent stage. Photosystem I is a part of the light-independent phase.
Electrons are energized and exit the pigment molecules during Photosystem II.

Solution
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Answer

The main difference is that Photosystem II initiates the electron transport chain by exciting electrons, while Photosystem I produces NADPH using those electrons. Explanation 1. Identify the Role of Photosystem II Photosystem II is involved in the light-dependent reactions of photosynthesis. It absorbs light energy, which excites electrons that are then transferred to an electron transport chain. 2. Identify the Role of Photosystem I Photosystem I also participates in the light-dependent reactions but primarily functions to produce NADPH by transferring electrons to NADP+. 3. Compare Electron Excitation In Photosystem II, electrons are energized and exit pigment molecules after absorbing sunlight. Photosystem I further energizes these electrons for NADPH production. 4. Clarify Misconceptions Both Photosystem I and II are part of the light-dependent reactions, not independent phases. Chlorophyll a and b absorb sunlight in both systems.

Explanation

1. Identify the Role of Photosystem II<br /> Photosystem II is involved in the light-dependent reactions of photosynthesis. It absorbs light energy, which excites electrons that are then transferred to an electron transport chain.<br /><br />2. Identify the Role of Photosystem I<br /> Photosystem I also participates in the light-dependent reactions but primarily functions to produce NADPH by transferring electrons to NADP+.<br /><br />3. Compare Electron Excitation<br /> In Photosystem II, electrons are energized and exit pigment molecules after absorbing sunlight. Photosystem I further energizes these electrons for NADPH production.<br /><br />4. Clarify Misconceptions<br /> Both Photosystem I and II are part of the light-dependent reactions, not independent phases. Chlorophyll a and b absorb sunlight in both systems.
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