Negative terminal.

As, the base means bottom and in bottom is n.t..

Explanation:

The base of an electric cell is its negative terminal.

Electric Cell: An electric cell is a device that converts chemical energy into electrical energy. It consists of two electrodes - a positive electrode (also known as the cathode) and a negative electrode (also known as the anode). These electrodes are immersed in an electrolyte solution.

Terminal: A terminal is a point of connection within an electric cell, where an external circuit can be connected to draw electrical energy. The positive terminal is connected to the positive electrode, and the negative terminal is connected to the negative electrode.

Function of Terminals:
- The positive terminal is connected to the positive electrode, which is usually made of a material that can easily give up electrons. This electrode is the source of electrons in the electric cell.
- The negative terminal is connected to the negative electrode, which is usually made of a material that can easily accept electrons. This electrode is the sink for electrons in the electric cell.

Role of Terminals in Electric Cell:
- When a circuit is connected to the terminals of an electric cell, electrons flow from the negative terminal through the external circuit to the positive terminal. This flow of electrons creates an electric current.
- The chemical reactions that occur within the cell cause a buildup of negative charges at the negative terminal and a buildup of positive charges at the positive terminal. This charge separation creates an electric potential difference between the terminals, which is necessary for the flow of electrons.

Conclusion:
In an electric cell, the base or negative terminal is the terminal connected to the negative electrode. It is the source of electrons and allows the flow of electrical energy through an external circuit.