Both statements are correct. The counter-current mechanism in the nephron’s loop of Henle establishes an osmotic gradient in the medullary interstitium, which is essential for the formation of concentrated urine.
Column I | Column II | ||
a | 6- 15 pairs of gill slits | i | Trygon |
b | Heterocercal caudal fin | ii | Cyclostomes |
c | Air Bladder | iii | Chondrichthyes |
d | Poison sting | iv | Osteichthyes |
A sphere of radius R is cut from a larger solid sphere of radius 2R as shown in the figure. The ratio of the moment of inertia of the smaller sphere to that of the rest part of the sphere about the Y-axis is :