Please discribe the "bract" clearly.?

Question

A bract is a modified or specialized leaf. (WikiPedia)

Answer 1

Some definitions of Bract:

A leaf that seems part of the flower cluster of a plant, or in the case of plants with insignificant flowers, may substitute for it in appearance by its bright coloring. Bougainvilleas are an example of wonderfully colorful bracts.

A modified leaf of an inflorescence. Several bracts form an involucre.

Leaves that develop just below the flowers on some plants. For example, poinsettia bracts, which most people think are the flowers because they turn red, pink, or white.

For more, see: http://en.mimi.hu/gardening/bract.html