Most of the Mass of Organic Material of a Plant

Question

Most of the mass of organic material of a plant comes from
A)water.
B)carbon dioxide.
C)soil minerals.
D)atmospheric oxygen.
E)nitrogen.

Accepted Answer

Carbon dioxide is the primary source of carbon for photosynthesis, which is the process by which plants produce organic matter. While water, soil minerals, atmospheric oxygen, and nitrogen are all important for plant growth, they are not the primary source of carbon for organic material.