HORTICULTURE

Detailed explanation-1: -In an egg, the protective covering is the shell; in a seed, the seed coat plays a similar role. In the egg, the white and the yolk store food for the growing animal; in a seed, the endosperm nourishes the developing embryo.

Detailed explanation-2: -At laying, the yolk is a sphere, centered in the middle of the egg. A thin, noncellular vitelline membrane surrounds it. The yolk contains almost all energy and other components necessary for the development of the bird, from first cleavage to hatching; only respiratory gases and water vapor pass through the eggshell.

Detailed explanation-3: -yolk, also called Deutoplasm, the nutritive material of an egg, used as food by a developing, embryonic animal.

Detailed explanation-4: -In a fresh egg, one can see white cords attached to the yolk sac. These two cords, called chalazae, are made of twisted strands of mucin fibers that are a special form of protein. The chalazae hold the yolk in the center of the egg.