Most of the Dry Weight of a Plant is Derived

Question

Most of the dry weight of a plant is derived from
A)NO₃ and CO₂.
B)K and CO₂.
C)PO₄ and K.
D)H₂O and K.
E)H₂O and CO₂.

Accepted Answer

The majority of a plant's dry weight comes from the uptake of water and carbon dioxide during photosynthesis. Therefore, the correct answer is E, which includes both H2O and CO2. Nitrogen, potassium, and phosphorus are important nutrients for plant growth, but they do not make up the majority of the plant's dry weight.