Where is the Central Rice Research Institute located?

Dicotyledons like mango,brinjal and monocotyledons like wheat and rice are placed under a taxonomic category known as

If the direction cosines of two lines are given by $l+m+n=0$ and $l^2-5m^2+n^2=0$,then the angle between them is

$A$ large open tank has two holes in the wall. One is a square hole of side $L$ at a depth $y$ from the top and the other is a circular hole of radius $R$ at a depth $4y$ from the top. When the tank is completely filled with water,the quantities of water flowing out per second from both holes are the same. Then,$R$ is equal to

Which of the following factors are favourable for the formation of oxyhaemoglobin in alveoli?

$A$ light pointer fixed to one prong of a tuning fork touches a vertical plate. The fork is set vibrating and the plate is allowed to fall freely. If eight oscillations are counted when the plate falls through $10 \, cm$,the frequency of the tuning fork is .... $Hz$