Science Assessment

A chemical reaction called photosynthesis occurs in a tree as the sun shines on its leaves.

How does the energy of the system of reactants of photosynthesis compare to the energy of the system of products?

1. The reactants have more energy than the products because energy is always given off during chemical reactions.
2. The reactants have less energy than the products because energy is created when sugars are made during photosynthesis.
3. The reactants have less energy than the products because photosynthesis requires an input of energy from the sun.
4. The reactants have the same amount of energy as the products because the amount of energy given off during photosynthesis is balanced by the amount of energy taken in from the sun.