Which of the following is a non-living level of biological organization?

$AB$ is an ionic solid. The ionic radii of $A^{+}$ and $B^{-}$ are respectively $r_c$ and $r_a$. Lattice energy of $AB$ is proportional to :

Identify the plant shown in the given figure.

The binding energy of deuteron is $2.2\,MeV$ and that of $_2^4He$ is $28\,MeV$. If two deuterons are fused to form one $_2^4He$ nucleus, then the energy released is ......... $MeV$.

The operation of a nuclear reactor is said to be critical when the value of the neutron multiplication factor $K$ is:

Which of the following statements is incorrect regarding living organisms?