ï»¿ Explain the affect of carbon dioxide on photosynthesis. from Biology Photosynthesis in Higher Plants Class 11 Assam Board

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Photosynthesis in Higher Plants

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Explain the affect of carbon dioxide on photosynthesis.

Affect of CO2Â on photosynthesis : Carbon dioxide acts as a major limitin factor for photosynhesis. The CO2 is 0.03 % in atmosphere and increase in amount of CO2Â upto 0.05% in atmosphere increases the rate of photosynthesis. Beyond it the rate declines. It is due to the increase in the temperature.

The C3 and C4 plants responds differently o the CO2 concentration. The C3 plants respond to a higher concentration of CO2 by showing increased rates of photosynthesis while the C4 plants saturate at low level of CO2 and do not show increase in the rate of photosynthesis.Â

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Name the first stable compound formed in C3Â 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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Where CO2 assimilation occurs in CPlants ?

In bundle sheath cells.
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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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