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

Plants obtain most of their carbon from carbon dioxide in the environment through photosynthesis. While water, soil minerals, atmospheric oxygen, and nitrogen also play important roles in plant growth and development, they do not contribute as significantly to the plant's mass as carbon dioxide does.