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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
Write a note on action and absorption spectrum.

Action Spectrum. Action spectrum is a curve which shows relative rates of photosynthesis at The graph of the action spectrum indicates that the maximum photosynthesis takes place in the blue and red parts of visible light.

Wave length of light in nm Graph of Action Spectrum

Absorption Spectrum. Absorption spectrum is a curve which shows the amount of light of different wavelengths absorbed by a substance or pigment. The absorption spectrum of two chlorophyll (chl “a” and chl “b”) and carotene shows that maximum light absorbed is in the blue and red wavelengths.

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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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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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What is stroma ?

Stroma is matrix or the cytoplasm of chloroplast where dark reaction of photosynthesis takes place.
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