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This statement is true, but it requires some clarification. Chloroplasts, the green, photosynthetic plastids, contain the pigment chlorophyll. The development of chlorophyll in chloroplasts is often light-dependent. If a plant is grown in the dark, its plastids (called etioplasts in this state) will not develop chlorophyll and remain colorless or pale. Other plastids, like leucoplasts (which store starch), are always colorless regardless of light.