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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
Describe about non-cyclic photophos-phorylation.

Non-Cyclic Photophosphorylation : The electrons lost by P680 (PS-II) are taken up by P700 (PS-I) and do not get back to P680 i.e., unidirectional and hence it is called non- cyclic phosphorylation. It involves both PS I and PS II. In this cycle both ATP and NAD(P)H are formed. Describe about non-cyclic photophos-phorylation.

Fig. Non-cyclic photophosphorylation

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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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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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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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