what does the sink in a plant do?
<answer> A sink is used for metabolic ATP, to construct new tissues, or being converted to starch for storage. <context> A sink is any place where the plant is using more sucrose than is produced. It may be used for metabolic ATP, to construct new tissues, or being converted to starch for storage. In any case there is less sucrose than needed. 3. At the source, the companion cells actively transport sucrose into the phloem tubes.