Protoplast is:
a. another name for protoplasm
b. an animal cell
c. a plant cell without a cell wall
d. a plant cell
Option (c) a plant cell without a cell wall.
Explanation: A Plant cell without a cell wall is called a protoplast. Protoplasts are used in tissue culture. It is done by the fusion of protoplasts in a solution of polyethylene glycol or sodium nitrate.