Question:
Splitting of water is associated with
Splitting of water is associated with
Updated On: Jul 7, 2022
- photosystem $I $
- lumen of thylakoid
- both photosystem $I$ and $II$
- inner surface of thylakoid membrane
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The Correct Option is D
Solution and Explanation
Light reactions occur inside the thylakoids, especially those of grana region. It involves two types of reactions photolysis of water and production of assimilatory power. The phenomenon of breaking up of water into hydrogen and oxygen in the illuminated chloroplasts is called photolysis or photocatalytic splitting of water. Water splitting complex is associated with the $PS II$, which itself is physically located on the inner surface of thylakoid membrane.
$4H_{2}O\rightleftharpoons 4H^{+} +4OH^{-}$
$4OH^{-} {->[{\text{oxygen evolving complex}}][Mn^{2+}, Ca^{2+}, Cl^{-}]} 2H_{2}O +O_{2}?
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Notes on Photorespiration
Concepts Used:
Photorespiration
Photorespiration is a wasteful process in plants in which plants intake oxygen, and sunlight and release carbon dioxide and no glucose is formed. Photorespiration generally takes place when the concentration of oxygen in the leaves is very high and that of carbon dioxide is very low.
In Calvin cycle carbon dioxide fixation does not take place . Hence, instead of carbon dioxide oxygen reacts with RuBP.
Photorespiration in C3 and C4 Plants:
- C4 plants do not undergo photorespiration due to their special mechanism to increase the CO2 level for enzyme binding.
- In Hatch and Slack Pathway, C4 acid and oxaloacetic acid breaks down to release CO2.
- This ensures a high concentration of intercellular CO2.
- Thus, in C4 plants, RuBisCO is more active as a carboxylase enzyme rather than as an oxygenase.
- This is why C4 plants have better productivity.