Assertion: Nephrons are of two types: cortical and juxtamedullary according to their relative position in the cortex.
Reason, Juxtamedullary nephrons have short loop of Henle while cortical nephrons have long loop of Henle.

Answer: CSolution: On the basis of location, the nephrons, are of two types, in majority of nephrons, the loop of henle is too short and extends only little into the medulla these nephrons are called cortical nephrons and form 85% of the total nephrons. In some of the nephrons, the loop of henle is very long and runs deep into the medulla. these nephrons are called juxtamedullary nephrons and form 15% of the total nephrons.