Question

How do autotrophs obtain carbon-dioxide and nitrogen to make their food

Answer 1

Autotrophs obtain CO₂ directly from the atmosphere from the stomata by the process of diffusion

But, they cannot obtain N₂ directly from the atmosphere, or rather they cannot synthesis the N₂ in the air , as they are bonded by triple bonds and hard to break. They obtain N₂ from the soil, where it has already been broken down by the nitrogen-fixing bacteria

Answer 2

Autotrophs obtain carbon dioxide during the process of photosynthesis from atmosphere and they obtain nitrogen from the roots.

Hope this was helpful!