Discussion
A chloroplast is about 5 micrometres long and a mitochondrion about 1 micrometre. How many times longer is the chloroplast?
Answer: C
Dividing 5 by 1 gives five. Comparing volumes rather than lengths would give a much larger factor, since volume scales with the cube of the linear dimension. Chloroplasts are correspondingly bulkier organelles than mitochondria.
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