What are plasmodesmata?

Which of the following inhibits leaf abscission?

Which reagent is used to remove $SO_4^{2-}$ and $Cl^{-}$ ions from a solution?

Which of the following is the strongest Lewis base?

If the mass defect of a nuclide is $3.32 \times 10^{-26} \ g$,its binding energy is (in $MeV$)?

Two point charges $+8q$ and $-2q$ are located at $x = 0$ and $x = L$ respectively. The location of a point on the $x$-axis at which the net electric field due to these two point charges is zero is