Which cell is attached to the lateral sides of sieve tubes?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
Companion cells are specialized parenchyma cells attached to the lateral sides of sieve tubes. These living, nucleated cells have dense cytoplasm and maintain a close physiological connection with sieve tube elements through numerous plasmodesmata (cytoplasmic connections). Since sieve tubes lose their nuclei at maturity, companion cells provide essential metabolic support, controlling the loading and unloading of nutrients and maintaining the functionality of the sieve tubes. This symbiotic relationship is crucial for efficient food transport throughout the plant.
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