Nucleus

The nucleus is the cell’s control centre because it contains the instructions that tell the cell what to do.

• Where it is: Usually a round or oval structure found inside the cytoplasm, often near the centre of the cell.
• What it contains: It holds genetic material (DNA), which works like an instruction book for making proteins and running the cell.
• What it controls: It helps regulate important activities such as growth, repair, and cell division (when one cell makes new cells).
• Protective covering: The nucleus is surrounded by a thin covering called the nuclear membrane, which helps protect the DNA and controls what enters and leaves the nucleus.
• Easy analogy: If a cell is like a school, the nucleus is like the principal’s office—it doesn’t do every job itself, but it gives instructions that keep everything organised and working properly.

Because the nucleus carries DNA, it also plays a big role in passing traits from parents to offspring.