Roots can sometimes act as a source rather than a sink for glucose during unfavorable periods of growth.
What are sources/sinks?
Sources are organs of plants where glucose is manufactured and sinks are organs of plants where glucose is stored.
Usually, the synthesis of glucose happens in leaves while some roots serve as storage organs for glucose.
When conditions are bad for glucose synthesis in leaves, storage roots sometimes become sources and send glucose to leaves for respiration.
More on source/sink can be found here: https://brainly.com/question/10483137
