Give three functions of nucleus.

Explanation

### Step-by-Step Solution:

1. **Definition of Nucleus**: The nucleus is a membrane-bound organelle found in eukaryotic cells. It is surrounded by a double membrane known as the nuclear membrane.

2. **Genetic Material**: The nucleus contains genetic material in the form of DNA. This DNA is organized into structures called chromatin.

3. **Function 1 - Control of Cellular Activities**: The nucleus regulates and controls various cellular activities. It is often referred to as the "brain of the cell" because it directs processes such as growth, metabolism, and reproduction.

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