Question

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photosynthesis is an example of
a reaction that gives off heat
an exothermic reaction

a reaction that emits energy
an endothermic reaction

Explanation:

Photosynthesis is a process where plants absorb energy (sunlight) to convert carbon dioxide and water into glucose and oxygen. Endothermic reactions absorb energy, while exothermic reactions release energy. Since photosynthesis absorbs energy (sunlight) to proceed, it is an example of an endothermic reaction. The other options: "a reaction that gives off heat" and "a reaction that emits energy" describe exothermic reactions, and "an exothermic reaction" is incorrect as photosynthesis absorbs energy.

Answer:

an endothermic reaction