Department of Energy Argonne National Laboratory Office of Science NEWTON's Homepage NEWTON's Homepage
NEWTON, Ask A Scientist!
NEWTON Home Page NEWTON Teachers Visit Our Archives Ask A Question How To Ask A Question Question of the Week Our Expert Scientists Volunteer at NEWTON! Frequently Asked Questions Referencing NEWTON About NEWTON About Ask A Scientist Education At Argonne Chlorophyll Activation
Name: Luke
Status: other
Grade: other
Location: N/A
Country: Philippines
Date: Fall 2010

Question:
What is chlorophyll activation?



Replies:
The following is a technical article but it does use the term chlorophyll activation:

http://www.plantphysiol.org/cgi/reprint/35/6/802.pdf

a type of photoactivation:

http://dictionary.reference.com/browse/photoactivation

Anthony R. Brach, PhD
Missouri Botanical Garden


Chlorophyll becomes activated (obtains a positive charge) when it absorbs a photon of light energy and loses an electron.

During the process of photosynthesis, a molecule of chlorophyll becomes activated when it absorbs light energy (photon), causing one of its electrons to move to a higher energy state. The energized electron is then transferred to an acceptor molecule. The missing electron is then replaced by an electron derived from the splitting of water. It is at the moment when the electron is leaving that the activated chlorophyll molecule exerts a positive charge attracting an electron from the water. Water is split into its components: protons (H+), electrons, and oxygen. Most of the oxygen split from the water is released into the atmosphere as molecular O2. In this process light energy is converted to chemical energy by a series of electron transfer reactions.

Dana Clark



Click here to return to the Botany Archives

NEWTON is an electronic community for Science, Math, and Computer Science K-12 Educators, sponsored and operated by Argonne National Laboratory's Educational Programs, Andrew Skipor, Ph.D., Head of Educational Programs.

For assistance with NEWTON contact a System Operator (help@newton.dep.anl.gov), or at Argonne's Educational Programs

NEWTON AND ASK A SCIENTIST
Educational Programs
Building 360
9700 S. Cass Ave.
Argonne, Illinois
60439-4845, USA
Update: June 2012
Weclome To Newton

Argonne National Laboratory