Question

39. Proteins are nitrogenous (nitrogen-containing) foods. How do plants get nitrogen for making proteins?​

Answer 1

Explanation:

Plants take nitrogen from the soil by absorption through their roots as amino acids, nitrate ions, nitrite ions, or ammonium ions. Most nitrogen obtained by terrestrial animals can be traced back to the eating of plants at some stage of the food chain.

Answer 2

Some plants have roots with nodules. They take the free nitrogen from air and convert them into plant proteins