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Difficulty: MediumPlant Nutrition and Photosynthesis

Match each chloroplast component or biochemical agent involved in photosynthesis on the left with its correct physiological function or characteristic on the right.

  • Thylakoid membraneLocation of chlorophyll excitation, photolysis of water, and electron transport chain complexes.
  • StromaSite of light-independent carbon dioxide fixation and soluble Calvin cycle enzyme activity.
  • NADP+\text{NADP}^+Terminal electron and hydrogen acceptor reduced during light-dependent reactions.
  • Ribulose-1,5-bisphosphate (RuBP)Five-carbon organic compound that acts as the initial carbon dioxide acceptor.

Answer

Thylakoid membrane matches with the location of chlorophyll excitation, photolysis of water, and electron transport chain complexes; Stroma matches with the site of light-independent carbon dioxide fixation and soluble Calvin cycle enzyme activity; NADP+\text{NADP}^+ matches with the terminal electron and hydrogen acceptor reduced during light-dependent reactions; Ribulose-1,5-bisphosphate (RuBP) matches with the five-carbon organic compound that acts as the initial carbon dioxide acceptor.
Each structural and biochemical component is correctly matched to its specific role in photosynthesis: Thylakoid membranes harbor photosystems for light absorption and water photolysis; Stroma contains enzymes for carbon dioxide fixation in the Calvin cycle; NADP+\text{NADP}^+ acts as the terminal hydrogen/electron acceptor; and RuBP functions as the five-carbon CO2\text{CO}_2 acceptor molecule.

Step-by-Step Solution

1
Identify the structural site of light absorption and water splitting in the chloroplast.
Thylakoid membranes hold photosynthetic pigments and proteins responsible for photolysis and non-cyclic electron flow.
Light-dependent reactions rely on membrane-bound chlorophyll complexes and electron carriers.
2
Identify the fluid compartment where carbon fixation occurs.
The stroma surrounds the thylakoids and contains the enzymes needed for dark reactions.
The Calvin cycle takes place in the fluid matrix using ATP and NADPH synthesized at the thylakoid membrane.
3
Identify the primary coenzyme electron acceptor and the carbon dioxide acceptor molecule.
NADP+\text{NADP}^+ acts as the terminal electron acceptor forming NADPH, while RuBP is the 5-carbon5\text{-carbon} acceptor of CO2\text{CO}_2.
NADPH supplies reducing power for carbohydrate synthesis, and RuBP reacts with CO2\text{CO}_2 in the initial carboxylation step.

Key Concept

Chloroplast Functional Compartmentalization and Photosynthetic Reactions
Estimated Time:1m 30s
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Topics

Plant Nutrition and Photosynthesis

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