To solve this problem, we need to understand the method of sterilization referred to as tubectomy. Let's analyze each option:$\newline \bullet$Option 1: Small part of the fallopian tube is removed or tied up.$\newline$ - Tubectomy is a surgical procedure for female sterilization.$\newline$ - It involves cutting, tying, or blocking the fallopian tubes to prevent eggs from reaching the uterus for fertilization.$\newline$ - This option correctly describes the procedure of tubectomy.$\newline \bullet$Option 2: Ovaries are removed surgically.$\newline$ - This procedure is known as oophorectomy, not tubectomy.$\newline$ - It involves the removal of one or both ovaries and is not a method of sterilization.$\newline \bullet$Option 3: Small part of vas deferens is removed or tied up.$\newline$ - This describes vasectomy, a male sterilization procedure, not tubectomy.$\newline \bullet$Option 4: Uterus is removed surgically.$\newline$ - This procedure is known as hysterectomy, not tubectomy.$\newline$ - It involves the removal of the uterus and is not primarily a sterilization method.$\newline$Therefore, the correct option is Option 1, which accurately describes tubectomy as a method of sterilization involving the fallopian tubes.