Photosynthesis as a Chemical Reaction Flashcards

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What does it mean to say that photosynthesis is a chemical reaction?

It means that carbon dioxide and water are changed into new substances, glucose and oxygen, by rearranging atoms.

In photosynthesis, what are the reactants?

The reactants are carbon dioxide and water.

In photosynthesis, what are the main products?

The main products are glucose and oxygen.

Where does the energy needed for the photosynthesis reaction come from?

The energy comes from light, usually from the Sun, which is absorbed by chlorophyll in chloroplasts.

Why is photosynthesis described as a "building up" reaction?

Because it joins small molecules, carbon dioxide and water, to make a larger molecule, glucose, storing energy in it.

Why do we say photosynthesis is a series of enzyme-controlled reactions?

Because photosynthesis happens in many small steps, and each step is sped up by a specific enzyme inside the chloroplast.

What happens to chemical bonds during the photosynthesis reaction?

Bonds in carbon dioxide and water molecules break, and new bonds form to make glucose and oxygen molecules.

How does photosynthesis show conservation of atoms?

No atoms are created or destroyed; the atoms from carbon dioxide and water are simply rearranged to form glucose and oxygen.

Why is photosynthesis such an important chemical reaction for living things?

It makes glucose, which stores chemical energy as food, and it releases oxygen, which many organisms need for respiration.

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