Mark the incorrect statement:

Options

A. Micturition is carried out by a reflex
B. ADH helps in `H_(2)O` elimination, making the urine hypotonic
C. Protein-free fluid is filtered from blood plasma into the Bowman's capsule
D. Glucose is actively reabsorbed in the PCT

Answer

To solve the question "Mark the incorrect statement," we need to analyze each of the four statements provided and determine which one is incorrect. Here’s a step-by-step breakdown:

### Step 1: Analyze the First Statement
**Statement:** "Maturation is carried out by reflex."
- **Explanation:** Maturation, or urination, is indeed a reflex action. It involves the stretch receptors in the bladder that signal the brain when the bladder is full, leading to the reflexive act of urination.
- **Conclusion:** This statement is **correct**.

### Step 2: Analyze the Second Statement
**Statement:** "ADH helps in the H2O elimination making the urine hypotonic."
- **Explanation:** ADH (Antidiuretic Hormone) is responsible for increasing water reabsorption in the kidneys, particularly in the collecting ducts. This leads to the production of concentrated urine, not hypotonic urine. Therefore, the statement is incorrect as it suggests that ADH causes the urine to be hypotonic.
- **Conclusion:** This statement is **incorrect**.

### Step 3: Analyze the Third Statement
**Statement:** "Protein-free fluid is filtered out from the blood plasma into the Bowman's capsule."
- **Explanation:** During glomerular filtration, blood plasma is filtered in the kidneys, and the filtrate that enters the Bowman's capsule is indeed free of proteins, as proteins are too large to pass through the filtration barrier.
- **Conclusion:** This statement is **correct**.

### Step 4: Analyze the Fourth Statement
**Statement:** "Glucose is actively reabsorbed in the PCT."
- **Explanation:** In the proximal convoluted tubule (PCT), glucose is reabsorbed actively along with sodium ions. This process is essential for conserving glucose in the body.
- **Conclusion:** This statement is **correct**.

### Final Conclusion
After analyzing all four statements, we find that the second statement is the only incorrect one. Therefore, the answer to the question is:

**Incorrect Statement:** "ADH helps in the H2O elimination making the urine hypotonic."

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