Assetion : Secreting hypotonic urine is effective in reducing urinary loss of water .
Reason : Hypotonic urine is more concentrated and higher in osmotic pressure than the blood .

Assertion : Reverse osmosis is used to purify sea water. Reason : Solvent molecules pass from concentrate solution solvent through seipermeable membrane if pressure higher than osmotic pressure is applied on solution side.

a) The urine gets concentrated by reabsorption of water. b) Vasopressin is secreted only when concentrated urine is to be passed out

Assertion (A): The urine passed by a person is thicker in summer than in winter. Reason (R): Perspiration is more in summer than in winter.

Assertion: Vasa recta is absent or highly reduced in cortical nephrons. Reason: Cortical nephrons are mainly concerned with concentration of urine.

Assertion: Vasa recta is absent or highly reduced in cortical nephrons. Reason: Cortical nephrons are mainly concerned with concentration of urine.

Assertion. In descending loop of Henele, urine is hypertonic while in ascending loop urine is hypotonic. Reason. Descending loop is impermeable to Na^(+) while ascending loop is impermeable to water

More ADH means (a) less permeable DCT (b) concentrated urine (c) dilute urine (d) fall in blood osmotic pressure

Assertion : Secretion of ADH is controlled by osmotic pressure of blood. Reason : Changes in osmotic pressure are noted by osmoreceptors present in the hypothalamus.