Vernon is using the diagram shown below to develop a model of photosynthesis. The letters A, B, and C each represent a reactant or product of the process.

In the light-dependent reactions, light strikes the oval thylakoids. Compound A enters the thylakoid, and compound B leaves it. In the light-independent reactions, compound C enters a cycle in the stroma, and sugars leave the cycle. ATP and NADPH cycle between the two sets of reactions.

Should water (H2O) be included in the model as a reactant or product? If so, how should it be included?

A. Yes, as reactant A.
B. Yes, as product B.
C. Yes, as reactant C.
D. No, it should not be included.

Photosynthesis is the process of preparing food in the presence of light, water, and carbon dioxide. Photosynthesis can be light-dependent or light-independent reactions.

The correct answer is:

Option A. Yes, as reactant A.

The mechanism can be explained as:

1. Light-dependent reactions convert light energy into chemical energy.

2. The light-dependent reactions require water and light to yield oxygen, hydrogen, and energy molecules.

3. The light is used to break down the molecule of water into oxygen and hydrogen when the light strikes the thylakoid.

4. The ATP is generated in the stroma of the thylakoid membrane. The excited electrons released during the splitting of water is utilized to produce high-energy molecule.

Thus, water molecule should be used as a reactant because it yields products.

To know more about light-dependent reactions, refer to the following link:

https://brainly.com/question/1424727