Why did you not see chloroplasts in the onion root cells? a. the roots are underground and are not exposed to light. therefore, they do not need chloroplasts. b. the chloroplasts are smaller in the onion root than in the onion leaves. therefore, they are harder to see. c. the cells are dividing and therefore, they have not had enough time to grow chloroplasts yet. d. the onion root cells are specialized to store food. therefore, there is not enough room for chloroplasts, too. submit for grading save and finish later?