Which part of the tobacco plant is infected by the nematode $Meloidogyne \ incognita$?

The plates of a parallel plate capacitor are charged up to $100 \, V$. $A$ $2 \, mm$ thick plate is inserted between the plates. To maintain the same potential difference,the distance between the capacitor plates is increased by $1.6 \, mm$. The dielectric constant of the plate is:

Pili or fimbriae are associated with which process?

If $f(x) = \left| \begin{array}{ccc} 2 \cos x & 1 & 0 \\ x - \frac{\pi}{2} & 2 \cos x & 1 \\ 0 & 1 & 2 \cos x \end{array} \right|$,then $f^{\prime}(\pi)$ is equal to

Which of the following is a method of sexual reproduction in algae?

The area (in sq units) bounded by the curves $y^2=4x$ and $x^2=4y$ is