Pheromone is

$A$ hereditary disease which is never passed on from father to son is

In printed scientific names, only the . . . . . . is capitalized.

Two wooden blocks of masses $M$ and $m$ are placed on a smooth horizontal surface as shown in the figure. If a force $P$ is applied to the system as shown in the figure such that the mass $m$ remains stationary with respect to the block of mass $M$, then the magnitude of the force $P$ is

If the altitudes of a triangle are in arithmetic progression,then the sides of the triangle are in

Which one of the following ions is the most stable in aqueous solution? (At. No. $Ti = 22, V = 23, Cr = 24, Mn = 25$)