Protective layer found at the site of abscission is
A thin layer formed due to the deposition of a phytohormone abscisic acid is called Abscission. Due to its formation, weakening and falling of petioles, pedicels, peduncles takes place. At the site of abscission formation, parenchyma is present as a protective layer.
So, the correct option is ‘Parenchymatous’.