Question

List the important events and end products of the light reaction?

Answer 1

Important events and end products of the light reaction are as follows. It is important to note that these events are not in the order they happen but in the order of their discovery by the scientists.

Light Absorption: Light absorption is carried out by Light-Harvesting Complex (LHC). Each photosystem has all the pigments (except one molecule of chlorophyll a) setting up a light-harvesting system. These pigments are also called the antennae. These pigments absorb light of different wavelengths and thus make the system more efficient. The single chlorophyll molecule functions as the reaction centre.

Water Splitting: Energy from sunlight is utilized to split.the water molecule into hydrogen ions and oxygen. Extra electrons released after the split are utilized NADP⁺ to NADPH.

Oxygen Release: Oxygen which is released after the splitting of water molecules goes out through stomata. Formation of High Energy Intermediates (ATP and NADPH). At the end of the light reaction, two energy-rich compounds ATP and NADPH are formed.