Question

Plants use sunlight as energy to convert carbon dioxide and water into glucose and oxygen. Which best describes the reaction?

The law of conservation of mass indicates the same amount of carbon will be found in the reactants as in the products.
The law of conservation of energy indicates the same amount of carbon will be found in the reactants as in the products.
The law of conservation of mass indicates the same amount of glucose will be found in the reactants as in the products.
The law of conservation of energy indicates the same amount of glucose will be found in the reactants as in the products.

Answer 1

The law of conservation of mass indicates the same amount of carbon will be found in the reactants as in the products.

Explanation: Photosynthesis rearranges atoms (carbon from CO2 ends up in glucose); sunlight supplies energy but does not create carbon, so total mass/number of carbon atoms is conserved.