The world's most problematic aquatic weed is:

Which type of mouthparts is present on the lateral side of the pre-oral cavity in cockroach?

Which one of the following elements on doping with germanium,makes it a $p$-type semiconductor?

$A$ coil having $N$ turns is wound tightly in the form of a spiral with inner and outer radii $a$ and $b$ respectively. When a current $I$ passes through the coil,the magnetic field at the centre is

If $0 < y < 2^{1/3}$ and $x(y^3 - 1) = 1$,then $\frac{2}{x} + \frac{2}{3x^3} + \frac{2}{5x^5} + \dots = $

The sum total of all the chemical reactions occurring in our body is known as