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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
Distinguish between photorespiration and respiration.

 Photorespiration Respiration 1. It is the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. 1. It is the process in living organisms involving the production of energy, typically with the intake of oxygen and the release of carbon dioxide from the oxidation of organic substances. 2. Light and the presence of cholorophyll is required 2. Light and cholorophyll are not required, 3. Carbon dioxide and water is used and oxygen is released 3. Oxygen  is used and carbon dioxide and water is formed. 4. Occurs only in plants 4. Occurs in all organisms. 5. Chloroplasts is involved 5. Mitochondria is involved 6. It stores energy 6. It release energy.
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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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Where CO2 assimilation occurs in CPlants ?

In bundle sheath cells.
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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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