Question

A field is abandoned, and an invasive plant that can live in nutrient-poor soil moves into the field. If the land is later cleared of this invasive species and it is discovered that the soil has an abundance of nitrogen compounds, what conclusion can best be made
A. The plants used up all of the phosphorus and potassium and left the nitrogen behind.
B. Primary succession always produces an abundance of nitrogen.
C. Bacteria in soil and in root nodules converted free nitrogen into nitrogen compounds.
D. The plants were able to produce nitrogen in their leaves.
E. More rock was weathered and broken down to release nitrogen compounds.

Answer 1

Answer:C. Bacteria in soil and in root nodules converted free nitrogen into nitrogen compounds

Explanation:the conversion of atmospheric nitrogen into nitrates and ammonia ,which the plant can use,is called nitrogen fixation.

Bacteria which are able tofix nitrogen includes azotobacter, clostridium sp.Rhizobium can also fix nitrogen through a mutualistic relationship with the roots of legumes.

When plants die, the plant parts can be broken down into amino acid which can be oxidized to ammonia.