Difference between Light and dark Reactions – Photosynthesis in Plants Part – IV

By | September 21, 2021
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Light and Dark reactions ( Calvin cycle / C3 Cycle) are sequential reactions which occur during Photosynthesis process.

In this post we will look into some important differences between these two vital aspects which are essential for synthesis of food in Plants and some other organisms.

Difference Light Reaction Dark or Calvin Cycle
Place of occurrenceThylakoid membrane of chloroplastStroma of Chloroplast
Requirement of LightSunlight is essential Do Not require sunlight, but takes place mostly during the day.
ProcessPigments absorbs of light energy from sun and converts into chemical energyInvolves fixation of CO2 to form Glucose.
ATP and NADPHProducedUtilized (That was produced during light phase)
OxygenReleasedNot liberated
OrderFirst phase of photosynthesisSecond phase ( follows light reactions)
Water – (Photolysis)split into Hydrogen ions and OxygenNo splitting of water observed
End productsATP, NADPH and OxygenGlucose

Part I of Photosynthesis : Introduction

Part II – Light Reaction

PART III – Calvin Cycle

Image Credit – Openstax biology.