Question

what is the main process by which plants obtain nitrogen from the soil? uptake of nitrates and ammonium, photosynthesis, absorbing nitrogen gas directly, respiration

Explanation:

Plants obtain nitrogen from the soil mainly in the form of nitrates and ammonium. They absorb these nitrogen - containing compounds through their roots. Photosynthesis is for producing energy using light, carbon - dioxide and water; plants cannot directly absorb nitrogen gas from the air as it is inert; respiration is for energy release.

Answer:

Uptake of nitrates and ammonium