Question

Why does a plant need nitrogen ?

Answer 1

for proteins

Step-by-step explanation:

Nitrogen is so vital because it is a major component of chlorophyll, the compound by which plants use sunlight energy to produce sugars from water and carbon dioxide (i.e., photosynthesis). It is also a major component of amino acids, the building blocks of proteins. Without proteins, plants wither and die.

Answer 2

Because they need it to get protein and create it. Protein helps the plants grow.