Which Two Elements Make Up More Than 90% of the Dry

Question

Which two elements make up more than 90% of the dry weight of plants?
A) carbon and nitrogen
B) oxygen and hydrogen
C) nitrogen and oxygen
D) oxygen and carbon
E) carbon and potassium

Accepted Answer

Oxygen and carbon make up more than 90% of the dry weight of plants, with carbon being the most abundant element. The other options listed are not correct as they do not represent the major components of plant composition.