Which herbicide is derived from urea and is used for weed control in tea, cotton, and tobacco crops?

All the springs in figures $(a)$,$(b)$,and $(c)$ are identical,each having a force constant $K$. The mass attached to each system is $m$. If $T_a, T_b$,and $T_c$ are the time periods of oscillations of the three systems respectively,then:

The pole of the straight line $x + 4y = 4$ with respect to the ellipse $x^2 + 4y^2 = 4$ is

If $\log (1+x) - \frac{2x}{2+x}$ is increasing, then

What is obtained when calcium carbide reacts with heavy water?

In which of the following plants can hybrid embryos be obtained?