Question

What is the difference between grain and seed?

Answer 1

A grain and a seed are botanically related but not the same thing. A seed is not the same as a grain in terms of nutrition and digestibility. A germinated or sprouted seed is even less similar, having undergone a complete physical and chemical transformation during and after germination – similar to a caterpillar emerging from its cocoon as a butterfly – everything changes.

Complete answer:

Grain	Seed
A single cereal fruit or seed.	It is a part of a plant's reproductive system.
A grain's four essential components are embryo, endosperm, seed coat, and bran.	A seed's three essential components are the embryo, endosperm, and seed coat.
It will not grow into a new plant. It has the potential to be used as a seed.	It has the potential to grow into a new plant
A grain is a small edible fruit harvested from grassy crops that is usually hard on the outside.	A seed is an embryonic plant covered in a seed coat that often contains some food.
Contain a fusion of seed coat and fruit.	Fruit covers the seed of flowering plants; gymnosperms produce naked seeds without fruits.
Viability is not important	Viability is important
Not treated with fungicide or pesticide	Maybe treated with fungicide or pesticides.
Fruit part is used as food	Endosperm is used as food
Ex: Rice,wheat, barley, oats	Ex: pumpkin seeds, sunflower seeds etc.

Note:
Respiration rate and other physiological and biological processes of seeds should be kept at low level during storage.It should satisfy all the quality norms.When dried, sections of the embryo of seeds such as peas (and pea-like seeds) have mealy properties comparable to grains.