Question

photosynthesis is an example of
an exothermic reaction.
an endothermic reaction.
a reaction that gives off heat.
a reaction that emits energy.

Explanation:

Photosynthesis is a process in which plants use light energy (from the sun) to convert carbon dioxide and water into glucose and oxygen. In an endothermic reaction, energy (in the form of heat or light in this case) is absorbed. For photosynthesis, light energy is absorbed. Exothermic reactions release heat or energy. Since photosynthesis takes in energy (light), it is not exothermic, does not give off heat, and does not emit energy. It absorbs energy.

Answer:

an endothermic reaction.