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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
Why does rate of photosynthesis in plants growing under the forest canopy show marked decrease ?

Rate of photosynthesis in plants growing under the forest canopy shows marked decrease because when the light passes through a forest canopy, there is a preferential absorption of blue and red regions of visible lights by the foliage of the trees, thereby reducing the visible light absorption in the plants growing under the forest canopy. Thus, there is a marked decrease in the rate of photosynthesis.
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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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 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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