How do autotrophs obtain $CO_{2}$ and $N_{2}$ to make their food?

(N/A) $(i)$ Autotrophs obtain $CO_{2}$ from the atmosphere through the diffusion process via stomata present on the surface of leaves.
$(ii)$ Autotrophs obtain nitrogen $(N_{2})$ from the soil in the form of inorganic nitrates and nitrites,which are absorbed by the roots along with water.