What is the method of using predators for the control of pests called?

The length of the perpendicular from the point $(2,-1,4)$ to the straight line $\frac{x+3}{10}=\frac{y-2}{-7}=\frac{z}{1}$ is:

$A$ body is projected with a speed $u \ m/s$ at an angle $\beta$ with the horizontal. The kinetic energy at the highest point is $\frac{3}{4}$ of the initial kinetic energy. The value of $\beta$ is $....^{\circ}$

Which of the following plants produces seeds but not flowers?

Which chemical must be applied to the roots to keep the leaves of a plant green?

What is the correct order of occurrence ($\%$ by weight) in air of $Ne, Ar$ and $Kr$?