Specialized parenchyma cells flanking sieve tubes. Their nuclei regulate the metabolic activities of the sieve tubes.
Plants, unlike animals, are immobile and have distinct growth patterns. Their cells are organized into two main types of tissues: and permanent tissues . ssc biology chapter 2 hand note exclusive
Once cells lose the ability to divide, they become permanent tissues. These are further divided into: Specialized parenchyma cells flanking sieve tubes