ï»¿ Give comparison between the following : (b)Â Cyclic and non-cyclic photophosphorylation Â  from Biology Photosynthesis in Higher Plants Class 11 Assam Board

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Photosynthesis in Higher Plants

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Give comparison between the following :

(b)Â Cyclic and non-cyclic photophosphorylation

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(b) Distinction between cyclic and non-cyclic photophosphorylation :

 Â Cyclic photophosphorylation Non-cyclic photophosphorylation 1. It is performed by PS I independently. It is performed by both PS I and PS II with the help of each other. 2. An external source of electrons is not required because the same electrons get recycled. The process requires an external electron donor, because the same electron is not recycled. 3. It is not connected with photolysis of water, therefore, no oxygen is evolved. It is connected with photolysis of water and liberation of oxygen. 4.Â It synthesizes only ATP. ATP synthesis with the production of NADPH. 5 Electron flow is cyclic. Electron flow is non-cyclic.Â

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Where CO2 assimilation occurs in CPlants ?

In bundle sheath cells.
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What is stroma ?

Stroma is matrix or the cytoplasm of chloroplast where dark reaction of photosynthesis takes place.
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What are grana ?

Grana are the stacks of thylakoids embedded in the stroma of a chloroplast. They are the sites of light reaction of photosynthesis.
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Why Rubisco is not affected by O2 in C4 plants ?

O2 is formed in mesophyll cells while Rubisco is present in bundle sheath cells. Therefore Rubisco does not come in contact with O2 and is thus not affected by it.
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Name the first stable compound formed in C3Â cycle.

3-phosphoglyceric acid (PGA)
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