Photosynthesis can be defined as the physicochemical process by which photosynthetic organisms use light energy to drive the synthesis of organic compounds. The photosynthetic process depends on a set of complex protein molecules that are located in and around a highly organized membrane.

A physical change is defined as the change where no new substance is formed. As a new product is formed in this process, therefore photosynthesis is a chemical change. In the respiration process, the glucose available in the body undergoes an oxidation reaction to form carbon dioxide and water along with energy.

When wood is burned, it goes through a chemical change that cannot be reversed. When tree leaves change color in the fall, they are going through chemical changes. When flowers die, they also go through chemical changes. There are no set rules on how to tell if something is a physical or chemical change.

Theory. Photosynthesis is a physico-chemical process by which plants, algae and some types of bacteria convert light energy into chemical energy. Green plants capture light energy and then convert water, carbon dioxide and other minerals into oxygen and other organic compounds.

Physicochemical processes are the normal intracellular and extracellular physical and chemical processes that are crucial for maintenance of normal homeostasis of a cell.

photosynthesis, the process by which green plants and certain other organisms transform light energy into chemical energy. During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.

Chlorophyll A and B are the two major pigments, involved in photosynthesis. Chlorophyll A is the primary pigment of photosynthesis, trapping the light energy and emitting highenergy electrons into the two photosystems P680 and P700. Chlorophyll B is the accessory pigment, passing the trapped energy into chlorophyll A.