Modern aspects of light in photosynthesis

Abstract

Scope of Study: The purpose of this study is three fold: (1) to provide a general knowledge of the function of light in the photosynthetic process so it may be easily communicated to the high school student; (2) to present a simple guide which may serve as resource material for other teachers; and (3) an endeavor to compile sufficient reference for the interested teacher to progress to further study.

Findings and Conclusions: A complete understanding of the energy changes which occur in photosynthesis must be left to the expert. However, there is a wealth of proven material that could be used to enrich the secondary school biological science curriculum.

Present evidence indicates that the role of light in the initial photochemical step is solely to increase the energy of the electrons in chlorophyll. Succeeding reactions transport these excited electrons along varying paths until the excititation energy is captured and converted into chemical energy.

This concept of energy transformation in plants should be introduced at an early level in an individual's schooling in order to develop his understanding of the relationship of all life to the sun.