Question

Protective layer found at the site of abscission is

• A. Parenchymatous
• B. Collenchymatous
• C. Sclerenchymatous
• D. Suberized

Answer 1

The correct option is D Suberized

In the area where the petiole of the leaf joins the twig, theres an abscission zone made up of two kinds of tissue the abscission layer and the protective layer. The protective layer is closest to the twig. The abscission layer is between the protective layer and the petiole. Both of these layers are only a few cells thick. During the growing season this layer of cells is healthy and keeps the leaves attached to the tree. But when the days become shorter, things begin to change in this zone. The protective layer begins a process called as suberization in which suberin, a waxy chemical found in cork, builds up in the cells. This provides an area of tissue thats impervious to the outside elements.

The suberized protective layer prevents leaf fall from leaving open wounds on the twigs. While the protective layer is becoming filled with corky tissue, the abscission layer also transforms