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What causes the diurnal changes in pH in the stroma of chloroplasts? Be as complete as...

What causes the diurnal changes in pH in the stroma of chloroplasts? Be as complete as possible

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Answer #1

During light reactions of photosynthesis, a water molecule is split and protons are actively transported into the thylakoid lumen. Energy from the sunlight is required for the splitting of a water molecule and active transport of protons.

The proton transport occurs against a concentration gradient by an active transport mechanism.

pH = -log[H+]

High [H+] = Low pH

Low [H+] = High pH

Since the lumen has relatively high proton concentration, it has low pH compared to the stroma.

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