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Hello everyone.
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Today we're going to identify the cell which was initially photosynthetic and that become part of the plant cells.
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So the question is the first photosynthetic organism on earth developed distinct mechanisms of electron transport for the purpose of generating chemical energy from sunlight.
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Eventually these photosystems were joined together to sink into a single more efficient system by a more complex single -celled organism.
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The free -living single -celled organism that is still abundant on the earth today is called what? that is thought to be related to the photosynthetic organelle in plant.
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Okay, now let's discuss the answers.
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Actually, that organelle in plant is itself a chloroplast.
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So the chloroplast cannot be that living cell.
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It is the organelle.
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So this one is wrong answer.
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About mitochondria, yes, mitochondria is present in animals as well as in plants, it does not undergo photosynthesis, so it is not the answer.
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Green sulfur bacteria and purple sulfur bacteria both may undergo photosynthesis, but they undergo an oxygenic photosynthesis, that is, in the absence of oxygen...