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Excretory Products And Their Elimination

Question
CBSEENBI11025658

Statement I. The renal fluid becomes increasingly concentrated, when it flows down in the descending limb of loop of Henle towards inner medulla, but its concentration decreases in the ascending limb, when it flows towards the cortex.

Statement II. The descending limb of the loop of Henle water is reabsorbed; the ascending limb is impermeable to water, but salts are absorbed.

  • Statement I is correct, but Statement II is incorrect

  • Statement II is correct, but Statement I is incorrect

  • Both statements are correct

  • Both statements are incorrect

Solution

A.

Statement I is correct, but Statement II is incorrect

The cellophane tube is surrounded by a fluid having same composition as plasma except nitrogenous wastes. The porous cellophane membrane of the tube allows the passage of molecule based on concentration gradient. It is impermeable to large molecules but permeable to micromolecules.