Statement 1: The final reabsorption of water from the urine into the blood occurs through the collection of the duct of a mammalian nephron resulting in the production of hyperosmotic urine.
Statement 2: The loop of Henle creates a sodium gradient in the interstitial fluid.

Both statements 1 and 2 are correct.

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Statement 1 is correct but statement 2 is incorrect.

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Statement 1 is incorrect but statement 2 is correct.

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Both statements 1 and 2 are incorrect.

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Solution

The correct option is A Both statements 1 and 2 are correct.
The counter-current mechanism in the loop of Henle and vasa recta helps in maintaining an increasing osmolarity of the interstitial fluid i.e, from $300 m O s m o l L^{-}$ in the cortex to about $1200 m O s m o l L^{- 1}$ in the inner medulla. This gradient is mainly caused by $N a C l$ and urea. This gradient thus helps in easy reabsorption of water from the filtrate in the collecting duct so as to produce hyperosmotic urine.
So the correct answer is 'Both statements 1 and 2 are correct.'

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Statement 1: The final reabsorption of water from the urine into the blood occurs through the collection of the duct of a mammalian nephron resulting in the production of hyperosmotic urine.Statement 2: The loop of Henle creates a sodium gradient in the interstitial fluid.

Statement 1: The final reabsorption of water from the urine into the blood occurs through the collection of the duct of a mammalian nephron resulting in the production of hyperosmotic urine.
Statement 2: The loop of Henle creates a sodium gradient in the interstitial fluid.