DENDROLOGY

Detailed explanation-1: -The coconut is a drupe or a fleshy fruit having hard lignified stone derived from the wall of the ovary. The seed coat is thus not thin, but membranous and tough.

Detailed explanation-2: -In gram, the outer seed coat is thick and strong and the inner coat is thin and membranous. In maize, the seed coat is membranous and generally fused with the fruit wall.

Detailed explanation-3: -"The fruit of the coconut (Cocos nucifera) is technically a large, dry drupe (D) composed of a thin outer layer (exocarp), a thick, fibrous middle layer called a mesocarp (F), and a hard inner layer called an endocarp (E) that surrounds a large seed.

Detailed explanation-4: -Seed coat consists of testa the outermost hard brownish covering. It protects the delicate inner parts of the seed from injury. Tegmen is a thin inner layer next to testa.