Which of the following statements about the reabsorption process in Henle's loop are correct ? (a) The descending limb of Henle's loop is permeable to water but almost impermeable to electrolytes. (b) Urine gets concentrated in Henle's loop. (c) Reabsorption of Na ^+ and water takes place in Henle's loop. (d) Active or passive transport of electrolytes occurs in the ascending limb of Henle's loop. Choose the correct

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Based on the NCERT biology textbook: Statement (a) is correct: The descending limb of the loop of Henle is permeable to water but almost impermeable to electrolytes. This causes the filtrate to become concentrated as it moves down. Statement (b) is correct: The primary role of Henle's loop (along with the vasa recta) is to maintain a high osmolarity in the medullary interstitial fluid, which is essential for the concentration of urine. Statement (d) is correct: The ascending limb of Henle's loop is impermeable to w