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Photosynthesis in Higher Plants

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
Differentiate between photosystem I and II.

 PS I PS II 1. The system is located in both the non-appressed part of grana thylakoids as well as stroma thylakoids. 1. Photosystem II is present in the appressed part of grana thylakoids. 2. Its photocentre is P700. 2. Its photocentre is P680. 3. Has an absorption peak at wavelength of 700nm. 3. Has an absorption peak at the wavelength of 680nm. 4. It receives electrons from photosystem II. 4. Electrons are received from photolytic reaction. 5. Molecular oxygen is not evolved in this system. 5. Molecular oxygen is evolved by break down of water.
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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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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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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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