Question

Fruit wall and seed coat are fused in a ______.

Answer 1

The fruit wall is also known as the pericarp.
The seed coat forms the outer layers of the ovule cells.

Complete Answer:
The epicarp is the outermost layer of the fruit wall. The epicarp of the fruit wall forms the tough outer layer of a fruit. The epicarp is sometimes called the exocarp. In citrus fruits, the epicarp is called the flavedo.
The mesocarp is the middle layer of the fruit wall. It is a fleshy layer and it is located between the fleshy epicarp and endocarp. The mesocarp is the part of a fruit that is usually nutritious and is eaten. Any fruit that is completely fleshy may also be referred to as mesocarp in some cases.
The endocarp is the innermost layer of the fruit wall. The endocarp surrounds the seeds of a fruit. The endocarp may be membranous or hard in fruits.
A seed coat forming only one layer is also called a testa. Seed coats are formed as the cells enlarge. Starch is deposited in the outer layers of the epidermis. This deposition of starch causes the lignification of the epidermis. The cell walls of the cells of the outer epidermis enlarge rapidly and compress the cytoplasm and the nucleus.
The fruit wall and the seed coat are fused into a grain.

Note:
The fruit wall is made out of three distinct layers in fleshy fruits. These layers are:
1. Epicarp
2. Mesocarp
3. Endocarp
The seed coat has two integuments, the inner integument and the outer integument. The inner integument of the seed coat forms the tegmen and the outer integument forms the testa.