Question : Observe the following diagram and write a note on light dependent, light indepen- dent reactions.

Question : Observe the following diagram and write a note on light dep

1.	Question : Observe the following diagram and write a note on light dependent, light indepen- dent reactions.
Answer» SOLUTION :Note on light dependent reactions : 1) Light dependent reactions are also called as photochemical phase which takes placein grana of chloroplast. 2) Several steps occur in the light dependent reaction. 3) Step. I : The chlorophyll on exposure to light energy becomes activated by absorbingphotons. 4) Step. II : The energy is USED in splitting the water molecule into two component ions NAMED hydrogen `(H^+)`, hydroxylion `(OH^(-))`. This reaction is known as photolysis. 5) Step - III : `OH^(-)` ions through a SERIES of steps produce water `(H_2O)` and `O_2`. 6) The end products of light reaction are ATP, NADPH'and `O_2` Note on dark reaction . or light independent reaction: 1 ) In light independent phase the hydrogen of theNADPH is used to combine it with `CO_2` by utilizingATP energy and to produce glucose. 2 ) After several reactions , finally glucose is convertedto starch . 3) All these reactions occur in the stroma region of the chloroplast . 4) This process is known as calvin cycle.