Plants primarily use the nitrogen they absorb to build proteins. Nitrogen is an essential element for the synthesis of amino acids, which are the building blocks of proteins. Additionally, nitrogen is a crucial component of nucleic acids (like DNA and RNA), chlorophyll, and other vital compounds within the plant.
While plants can influence the soil's nitrogen content through processes like nitrogen fixation and other mechanisms, they do not store nitrogen in the soil for their own use. Nitrogen is not directly used in photosynthesis in a way that would be specified by the options given, nor do plants kill other plants primarily for nitrogen; however, some plants may compete for nitrogen in the soil. Overall, building proteins is the best answer to your question.
1 answer