**Removal of the proximal convoluted tubule from the nephron will result in more diluted urine.**

The proximal convoluted tubule (PCT) is a crucial component of the nephron, which is the functional unit of the kidney responsible for the formation of urine. It plays a vital role in the reabsorption of water, ions, and other important substances from the glomerular filtrate back into the bloodstream, while also facilitating the excretion of waste products and toxins.

**1. Role of the Proximal Convoluted Tubule**
- The PCT is the first segment of the renal tubule and is located immediately after the glomerulus in the filtration process.
- It is highly convoluted, allowing for a large surface area for reabsorption and secretion.
- About 60-70% of the filtered water, sodium, and chloride ions are reabsorbed in the PCT, along with the majority of glucose, amino acids, and other essential nutrients.
- The reabsorption of water and solutes occurs through the active transport and passive diffusion processes.

**2. Influence on Urine Concentration**
- The removal of the proximal convoluted tubule would disrupt the reabsorption mechanism, resulting in decreased reabsorption of water, sodium, and other solutes.
- As a consequence, a larger volume of water and solutes would continue to move down the nephron, ultimately reaching the distal convoluted tubule and the collecting duct.
- Since the PCT is responsible for reabsorbing the majority of water, its absence would lead to a decreased concentration gradient for water reabsorption in the collecting duct.
- This would result in a higher volume of water being excreted in the urine, leading to more diluted urine.

**3. Overall Effect on Urine Formation**
- Although the absence of the PCT would not completely inhibit urine formation, it would significantly alter the quality and quantity of urine produced.
- The urine produced would have a lower concentration of solutes, making it more diluted.
- However, other segments of the nephron, such as the loop of Henle and the distal convoluted tubule, would still contribute to the reabsorption and concentration of urine to some extent.

Therefore, the removal of the proximal convoluted tubule from the nephron would lead to the formation of more diluted urine as a result of impaired reabsorption of water, solutes, and essential nutrients.

Max reabsorption takes place in PCT, thus its removal would result in less absorption of water resulting in dilute urine. so,its op A.