Where is the International Rice Research Institute $(IRRI)$ located?

To increase milk yield,a cow is given:

Xylem tissue is composed of

$A$ charged particle is released from rest in a region of steady and uniform electric and magnetic fields which are parallel to each other. The particle will move in a

One circular ring and one circular disc,both having the same mass and radius. The ratio of their moments of inertia about the axes passing through their centres and perpendicular to their planes will be:

$\operatorname{cosec} 15^{\circ} + \sec 15^{\circ}$ is equal to :