Question

during the nitrogen cycle, through which structure are nitrogen compounds first absorbed into the plant?
roots
leaves
flower
stem

Explanation:

In the nitrogen cycle, plants absorb nitrogen compounds (like nitrates) from the soil. Roots are the plant structures in contact with the soil and are responsible for absorbing water and nutrients, including nitrogen - containing compounds. Leaves are for photosynthesis, flowers for reproduction, and stems for support and transport (after absorption by roots), so nitrogen compounds are first absorbed through roots.

Answer:

A. roots