In the chemical process of photosynthesis water is a

In the chemical process of photosynthesis, water acts as an electron donor.

Further Explanation:

Photosynthesis starts with the absorption of solar or light energy by the plant pigments called chlorophyll. The activated chlorophyll molecule helps in the electron transfer from one acceptor to another forming a chain. Photosynthesis is an anabolic process.  

In photosynthesis reaction, glucose and oxygen produce with the help of water, carbon dioxide and sunlight. In the photosynthesis reaction, six molecules of carbon dioxide and six molecules of water react in the presence of the sunlight to make one glucose molecule and the six molecules of oxygen are also produced. The major function of water is to release molecule of oxygen from water into the environment in the form of oxygen gas. Water is breakdown and produces electrons which required to starts the photosystem. It also helps in reducing the NADP to NADPH through photolysis of water.  

The photosynthesis reaction is mainly divided into two phases which are:

Light-dependent phase: In this phase, the absorbed light is utilized to produce molecules which carry energy that is used in the second phase of the reaction to form carbohydrates by reducing carbon dioxide

Light-independent phase: This process utilizes the products formed through the light-dependent phase

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Answer Details:

Grade: High School

Subject: Biology

Chapter: Plant Cell

Keywords:

Light-dependent reaction, thylakoid, stroma, grana, membrane, photosynthesis, light-independent reaction, carbon dioxide, water, chemical energy, anabolic process.

a. the production of carbon dioxide through the process of photosynthesis

the endomembrane system i think