Question

how does autotrophs obtain CO2 and N2 for make their food

Answer 1

(1) Co2 from atmosphere through diffusion stomata are responsible for this. 

(2) N2 is absorbed from soil in the form of nitrates and nitrites. Nitrogen fixing bacteria convert atmospheric nitrogen into these forms and roots are responsible for absorption.

Answer 2

Hello there your answer

1) CO2 is obtained from the atmosphere as we give out CO2 plants stomata will take it 

2)nitrogen is obtained from soil as plants cant take atmospheric nitrogen rhizobium ans some other bacteria fix it in the soil 

Hope it helps you dear...