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Photosynthesis in Higher Plants

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Class 10 Class 12
How is C4 pathway more energy expensive that C3 ?

C3 Cycle needs 18 ATP molecules for synthesis of one molecule of glucose whereas the Ccycle needs 30 ATP molecules. Due to high energy requirement C4 cycle is more energy expensive than the C3 cycle.
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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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Name the first stable compound formed in C3 cycle.

3-phosphoglyceric acid (PGA)
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Where CO2 assimilation occurs in CPlants ?

In bundle sheath cells.
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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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