Option 1: Both the statements are individually true and Statement II is the correct explanation of Statement I.

This option suggests that both statements are true and that Statement II correctly explains Statement I. Statement I states that an amoeba is a unicellular organism and that the single cell performs all the functions of a living organism. This is true because amoebas are indeed unicellular organisms, meaning they are composed of a single cell. And within this single cell, all the necessary functions of a living organism, such as nutrition, reproduction, and movement, are carried out.

Statement II states that the cell is the fundamental unit of a living organism. This is also true because cells are the building blocks of life and are responsible for the structure and functioning of all living organisms.

Therefore, Option 1 correctly suggests that both statements are true, and Statement II provides a correct explanation for Statement I.