Which of the following is present only in plant cell?

The correct option is Cell wall.

Explanation:

1. Cell Wall: The cell wall is a rigid outer layer surrounding the cell membrane present in plants, fungi, bacteria, and some protists. In plant cells, it is primarily made of cellulose and provides structural support, protection, and rigidity. Animal cells completely lack a cell wall.

2. Vacuoles: While plant cells typically contain one large central vacuole, animal cells can also possess smaller, temporary vacuoles. Therefore, vacuoles are not exclusive to plant cells.

3. Nucleus: The nucleus is a membrane-bound organelle that contains genetic material (DNA). It is present in all eukaryotic cells, including both plant and animal cells.

4. Endoplasmic Reticulum: The endoplasmic reticulum (ER) is a network of membranes involved in protein and lipid synthesis. It is an essential organelle found in both plant and animal cells.

Thus, among the given options, the cell wall is the structure present only in plant cells and not in animal cells.