How does a cork act as a protective tissue?

Hint: Cork is the light but tough material which is the outer layer of the bark of a tree. And is used specially for stoppers and insulation. In other words cork is the light, thick, elastic outer bark of an oak tree.

Complete step by step answer: Cork is a protective tissue with the suberized cells. That form stick and waterproof covering of older stem and root. Cork is the outer protective layer of the tree. Suberin is a waterproofing waxy substance that restricts the water movement. Presence of submarines in dead cells of cork and absence of intercellular spaces make the cells. Impermeable to water and gases thereby protecting the underlying tissues from mechanical injury and pathogenic infection.
The cork cells are dead and compactly packed with no intercellular space. their cell walls are coated with the waxy substance. Submarines do not allow water and gases to pass through therefore it protects plants against mechanical injury and also prevents the loss of water by evaporation. Cork is hard and very rigid that can give good insulation. protective tissues are a special type of tissues which protects other cells and tissues from the external injuries, basically, it works as an external barrier which prevents the external forces.

Additional Information: Cork is one of the world's most important renewable forest products. The cork is stripped off the tree in a thick cylindrical layer Each tree is harvested after every 9 years. Cork is also used for insulation,floats, engine gaskets, and even skirts, heels and handbags.So it is one of the renewable sources.

Note: Cork is the light off material which comes from outside of an oak tree. It is a protective tissue with suberized cells. Cork is provided with submarines. Subring is a waterproofing waxy substance that prevents water from entering into the tree and it prevents plants from injury and from loss of evaporation.