Mon September 05, 2011 By:

The splitting up of water molecule in the light dependent part of photosynthesis is done with the help of chemical energy or not?

Expert Reply
Tue September 06, 2011

Light energy is needed to split water molecule during photosynthesis.

In the Light Dependent Processes (Light Reactions) light strikes chlorophyll a in such a way as to excite electrons to a higher energy state. In a series of reactions the energy is converted (along an electron transport process) into ATP and NADPH. Water is split in the process, releasing oxygen as a by-product of the reaction. The ATP and NADPH are used to make C-C bonds in the Light Independent Process (Dark Reactions).
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