Light dependent reaction

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Where does the light dependent reaction take place?
Thylakoids
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What is oxidation?
Loss of electrons/hydrogen or gain of oxygen
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What is reduction?
Gain of electrons/hydrogen or loss of oxygen
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What happens when a chlorophyll molecule absorbs light energy?
Raises the energy level of electrons within the molecule - results in them leaving and being taken up by an electron carrier (chlorophyll becomes oxidised - carrier = reduced)
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How is ATP generated in this reaction?
Electrons are passed along electron carriers, each new carrier is at a lower energy level than the previous one, so the electrons lose energy at each stage - this energy is used to make ATP
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Why must a chlorophyll molecule have its electrons replaced once they leave?
In order for it to continue absorbing light
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How are the replacement electrons in a chlorophyll molecule provided?
Splitting water molecules using light energy (photolysis)
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What does photolysis produce?
Hydrogen ions (protons) and electrons
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What happens to hydrogen ions produced by photolysis?
Taken up by reduced NADP and enters the light independent reaction
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Why is reduced NADP important?
Further potential source of chemical energy to the plant.
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What are the main events of this LD reaction?
Capturing light energy; producing ATP; oxidation and reduction; photolysis
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How are chloroplasts adapted for LD reaction?
Thylakoid membranes provide large surface area; granal membranes have enzymes attached; contain DNA and ribosomes
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Other cards in this set

Card 2

Front

What is oxidation?

Back

Loss of electrons/hydrogen or gain of oxygen

Card 3

Front

What is reduction?

Back

Preview of the front of card 3

Card 4

Front

What happens when a chlorophyll molecule absorbs light energy?

Back

Preview of the front of card 4

Card 5

Front

How is ATP generated in this reaction?

Back

Preview of the front of card 5
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