Which of the following is NOT one of the three main parts of cell?

Vacuole 

The correct answer is Option (3) –Vacuole

- The three main parts of a cell are:

1. Cell membrane: The cell membrane, also known as the plasma membrane, is a thin, flexible, and semi-permeable barrier that surrounds the cell.

2. Cytoplasm: The cytoplasm is the gel-like fluid that fills the space inside the cell between the cell membrane and the nucleus.

3. Nucleus: The nucleus is the central organelle in eukaryotic cells (cells with a true nucleus). It contains the cell's genetic material in the form of DNA, which is organized into chromosomes.

-   A vacuole is a membrane-bound organelle found in the cells of many organisms, including plants, fungi, and some protists. Vacuoles play essential roles in cell structure, storage, and various cellular processes.

- In plant cells, the vacuole is particularly prominent and occupies a significant portion of the cell's volume.

- Vacuoles in plant cells are typically larger than in animal cells and are filled with a fluid called cell sap, which is a solution of water, ions, sugars, pigments, and other molecules.