Question

based on the model and the table, which change occurs during the time the elodea are exposed to light?
a. the bonds in glucose are broken apart to provide the elodea with energy, using energy from the light and producing co₂ and h₂o as by - products.
b. the co₂ and h₂o molecules are broken apart, and the atoms are rearranged to produce oxygen and glucose, with light energy being converted to chemical energy in the bonds of glucose.
c. the light reacts with the oxygen and glucose, which releases energy for the elodea to use and produces co₂ and h₂o as by - products.
d. the light provides the energy needed to form the bonds between the co₂ and h₂o molecules to create glucose molecules, with oxygen being produced as a by - product.

Explanation:

Elodea is a plant that undergoes photosynthesis when exposed to light. In photosynthesis, carbon - dioxide ($CO_2$) and water ($H_2O$) are used to produce oxygen and glucose, with light energy being converted to chemical energy in the bonds of glucose. Option A describes cellular respiration. Option C has an incorrect reaction description as light does not react with oxygen and glucose in the way described. Option D has an incorrect mechanism for glucose formation.

Answer:

B. The $CO_2$ and $H_2O$ molecules are broken apart, and the atoms are rearranged to produce oxygen and glucose, with light energy being converted to chemical energy in the bonds of glucose.