To solve this problem, we need to understand the function of the proximal convoluted tubule (PCT) in the nephron and the consequences of its removal.$\newline \bullet$The proximal convoluted tubule is responsible for the reabsorption of a significant portion of the filtrate. This includes:$\newline$ - Approximately 65-70% of water and sodium ions $(Na^{+}) \newline$ - Nearly all glucose and amino acids$\newline$ - Bicarbonate ions $(HCO_{3}^{-})$ and other ions$\newline \bullet$If the PCT is removed, the reabsorption of these substances will be significantly reduced.$\newline \bullet$As a result, more water and solutes will remain in the filtrate, leading to the production of more diluted urine.$\newline$Therefore, the removal of the proximal convoluted tubule will result in more diluted urine.$\newline$This corresponds to Option 1.