![](http://uploads.cdn.yaclass.in/upload/pumpa/img_4.png)
PUMPA - SMART LEARNING
எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்
Book Free DemoThe mechanism of photosynthesis takes places two sequential stages:
- The light dependent reactions and
- The light-independent reactions ( cycle or Calvin cycle).
As we have learnt, the process of photosynthesis and its various stages occurs inside the chloroplast. Hence, the structural organization of chloroplast is in such a way that the light-dependent
(Light reaction) and light-independent (Dark reaction) occur at different sites in the chloroplast.
(Light reaction) and light-independent (Dark reaction) occur at different sites in the chloroplast.
![Figure080106.jpg](https://resources.cdn.yaclass.in/5805a110-5cf5-4caf-b3bd-fbda14885753/Figure080106w500.jpg)
Picture indicating the sites of light and dark reactions
1. Light dependent reactions (Hill reaction/Light reaction):
It is also known as Hill reaction as it was discovered by Robin Hill in the year \(1939\).
![Screenshot 2021-05-25 173559.png](https://resources.cdn.yaclass.in/187a677c-c07b-4374-b14c-2f943cb34198/Screenshot20210525173559w400.png)
Light reactions
- Light-dependent processes occur in the thylakoid membranes (grana) of the chloroplasts and require a constant source of light energy.
- The overall goal of these reactions is to transform light energy into chemical energy.
- Hence, in these reactions, the photosynthetic pigments absorb the light energy and convert it into
chemical energy ATP and \(NADPH_2\). - These light reaction products pass from the thylakoid to the stroma of the chloroplast.
Abbreviations to know:
ATP | Adenosine Triphosphate |
ADP | Adenosine Diphosphate |
NAD | Nicotinamide Adenine Dinucleotide |
NADP | Nicotinamide Adenine Dinucleotide phosphate |
NADPH | Nicotinamide Adenine Dinucleotide phosphate (reduced form) |
Fact:
![HEX codes (2).png](https://resources.cdn.yaclass.in/662b439c-0b5c-4a05-a048-ccb45c5517f8/HEXcodes2w635.png)
Reference:
https://commons.wikimedia.org/wiki/File:Figure_08_01_06.jpg
https://commons.wikimedia.org/wiki/File:ATP_Cycle.svg