In mitochondria, an electron transport chain pumps protons from the matrix into the intermembrane space, whereas in chloroplasts, an electron transport chain pumps protons from the - Stroma to the thylakoid space.
The correct option is b.
A membrane-bound organelle called a plastid, or chloroplast, is a kind that primarily facilitates photosynthesis in plant and algal cells. Large organelles that range in length from 5 to 10 m, plant chloroplasts are surrounded by a double membrane known as the chloroplast envelope, just like mitochondria.
The thylakoid membrane is a third internal membrane system that chloroplasts have in addition to the inner and outer membranes of the envelope.
The plant cell contains a variety of organelles, including chloroplasts. They are thought to have developed from cyanobacteria that were formerly symbiotic. Similar endosymbiosis processes that included the engulfment of an aerobic prokaryote are hypothesised to have given rise to mitochondria.
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