The outer covering of the grain is called Husk.
exskeleton
A hard outer covering protects an insect's soft body and gives the insect its shape.
The outer covering of corn is known as the husk, which consists of green, leafy layers that protect the ears of corn as they develop on the plant. Beneath the husk, the kernels are encased in a protective layer called the pericarp, which is the hard outer shell of each individual kernel. Together, these layers help shield the corn from pests and environmental factors.
Cornea
exoskeleton
The hard outer covering that protects the animals body can be a couple of things. It is most likely a shell.
A Guppy is a tropical fish, and has an outer covering of fish-scales.
capsule
Warmer
calabashes un lng alam ko........... LARA_12 :)
the hull