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Photosynthesis in Higher Plants

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CBSE Gujarat Board Haryana Board

## Previous Year Papers

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Class 10 Class 12
What are the steps common to C3 and C4 cycle ?

Steps common to C3 and C4 cycle are :

1. Photolysis of water in light reaction is common to both C3 and C4 cycle.

2. In both, dark reaction occurs in stroma region of chloroplast.

3. Calvin cycle results in the formation of starch in both the types of plants.

4. Both undergo phases of carboxylation and regeneration of RUBP during dark reaction.

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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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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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Name the first stable compound formed in C3 cycle.

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

In bundle sheath cells.
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