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Photosynthesis in Higher Plants

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Class 10 Class 12
Describe the effect of oxygen on photosynthesis.

Effect of oxygen on photosynthesis : Oxygen is not the raw material for photosynthesis, but in the absence of oxygen, photosynthesis cannot occur. A slight increase in the amount of oxygen reduces the rate of photosynthesis in C3 plants. Higher concentration of oxygen reduces the rate of photosynthesis in C3 and C4 plants. It is called Warburg’s effett.
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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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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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