Question:

Which part of the nephron is impermeable to water?

Proximal convoluted tubule

Ascending limb of loop of Henle

Descending limb of loop of Henle

Distal convoluted tubule

Solution:

Ascending limb of loop of Henle is impermeable to water. Here water is not reabsorbed, rather sodium, potassium, magnesium and chloride are reabsorbed and therefore the filtrate becomes hypotonic to blood plasma.