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Photosynthesis in Higher Plants

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Biology

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Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
 Write notes on photosystem I and II.

Photosystem I [PSI] :

Location : It is present in the membrane of stroma thylakoids and non-appressed parts of grana thylakoids.

Pigment molecules : In PS I the reaction centre chlorophyll a which has an absorption peak at P700

Reducing agents : The PS I has following reducing agents viz. ferrodoxin, plastoquinone, cytochrome complex, n-plastocyanin.

Function of PS I : In PS I cyclic photophos-phorylation occurs.

Photosystem II [PS II] :

Location : It is present in appressed part of grana thylakoids.

Pigment molecules : It has in the centre special type of chlorophyll ‘a’ molecules called P680.

Reducing agents : PS II has quencher, plastoquinone, cytochrome complex and plastocyanin reducing agents.

Function : In PS II non-cyclic photophosphorylation occurs, alongwith photolysis of water.

 

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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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 What is stroma ?

Stroma is matrix or the cytoplasm of chloroplast where dark reaction of photosynthesis takes place.
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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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Where CO2 assimilation occurs in CPlants ?

In bundle sheath cells.
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Name the first stable compound formed in C3 cycle.

3-phosphoglyceric acid (PGA)
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