Plants need building materials beyond the glucose provided by photosynthesis in order to thrive. the presence of which element in auxin best provides evidence for this? a. oxygenb. carbonc. hydrogend. nitrogen

The correct answer is: nitrogen, which is not present in glucose, but it is present in auxin.

Nitrogen is one of the essential elements of plant which is involved in plants’ metabolic processes. It is being absorbed from the soil in the form of nitrate ions. Since nitrogen is important and often a limiting factor for plants, it is present in different fertilizers.

One of the roles of nitrogen in plants is structural. It is component of amino acids and nucleic acids. Also, present in the chlorophyll.

Nitrogen enhance the rate of photosynthesis and improves growth and development of the plant..

looks like the answer is     c     to me!