Labeled Red Onion Cell

Students may note that the onion cells lack chloroplasts and chlorophyll (or you can point this out to younger students). Students can be asked (individually, or in groups) to propose hypotheses for why this is (onion plant leaves and shoots, which grow above ground, are green and do have chloroplasts, while the onion bulb, which functions primarily as an energy storage organ, grows below ground, where it has no access to sunlight and thus has no need for chloroplasts).


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