What type of life cycle in plants is indicated by the given figure?

$I.$ $DNA$ being a hydrophilic molecule cannot pass through cell membranes.
$II.$ The bacteria should be made competent to accept the $DNA$ molecule.
The correct option regarding the above statements is:

The work function of a metal is $4.2 \ eV$. Its threshold wavelength will be ............ $\mathring{A}$.

The equation $16 x^2+y^2+8 x y-74 x-78 y+212=0$ represents:

The ends of an element of zinc wire are kept at a small temperature difference $\Delta T$ and a small current $I$ is passed through the wire. Then,the heat developed per unit time

Two identical charged spherical drops, each of capacitance $C$, merge to form a single drop. The resultant capacitance is: