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 |
The basic filtration unit of the excretory system in human beings is:
A bob of heavy mass \(m\) is suspended by a light string of length \(l\). The bob is given a horizontal velocity \(v_0\) as shown in figure. If the string gets slack at some point P making an angle \( \theta \) from the horizontal, the ratio of the speed \(v\) of the bob at point P to its initial speed \(v_0\) is :