The length of the chloroplast in the image is 100um.
In the attached image we can observe a red circle known as a red sizing bead over the chloroplast. Given that the size of the bead is 10um in diameter, we can conclude that the width of the chloroplast falls in the range of about 30um. By observing that the length is much greater than the width, we know it must be at least higher than 30, and it would seem to be approximately three times as much. With this information, we can conclude that of the options given, the chloroplast would be 100um in length.
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