AP BIOLOGY

Detailed explanation-1: -The outer protective layer or bark of a tree is known as the cork. It is made up of dead cells. It protects the plant against mechanical injury, extreme temperature, etc. It also prevents the loss of water by evaporation.

Detailed explanation-2: -They also have a chemical called suberin in their walls that makes them impermeable to gases and water . Thus cork protects the underlying tissues from excessive ater loss adverse external environments and mechanical injuries.

Detailed explanation-3: -Final answer: Epithelial tissue forms a protective covering all over the body.

Detailed explanation-4: -Cork tissue is also known as phellem. Cork cells are dead when mature and hence form the outer layer in stems and roots of woody plants.

Detailed explanation-5: -The outer protective coat of a tree is called cork. It is one of the components of tree bark. The tissues of bark become old and the secondary meristem replaces them. Cork is made up of multiple thick layers as a result of this process.