A plant cell without cell wall is called A. ProtoplastB. ProtoplastC. Nucleoplasm D. Explant

The correct answer is A. Protoplast.

Here's the explanation:

A protoplast is a plant cell that has had its cell wall removed, leaving only the plasma membrane and the contents of the cell (nucleus, cytoplasm, etc.). The cell wall is typically removed using enzymes like cellulase in laboratory conditions.

Now, let's look at the other options:

B. Protoplast: This is the same as option A, so it's not a new option.
C. Nucleoplasm: This refers to the substance inside the nucleus, not the entire cell.
D. Explant: An explant is a small piece of plant tissue that is taken from a plant to be cultured in a lab, but it’s not specifically a plant cell without a cell wall.
Thus, the correct term for a plant cell without its cell wall is protoplast.